Now, let me ask the big question: is there a fighter craft which seems redundant, or completely useless? If yes, I could rework it into a new fighter craft as suggested in the first post. If not, I'd need new graphics, which may not be as easy (depending if I can plunder something from Piratez or some other mod, or I have to draw it from scratch).
I find the Elerium-powered crafts from original game, except for the AVENGER, to be completely redundant. In fact, the only two crafts where the Elerium usage is justified at all are the AVENGER and TORMENTOR. Everything else — all interception tasks, but the hardest ones — is more or less amenable to advanced human synthesis crafts.
However, I think it's justifiable to keep those crafts in game, if only as lore and logic continuity elements. It's a rather boutique experience to build what has essentially been a research prototype for what appears to be a more advanced craft.
The same argument goes for the Zrbite-enabled crafts, though in this mod it appears to only be used with the IRONFIST craft, with no original TFTD crafts, like e.g. Leviathan, being available. So, the point is moot on this one.
The fighter crafts in the following progression form a natural chain of advancement in capability:
MiG -> INTERCEPTOR -> RAVEN -> THUNDERSTORM -> TORMENTOR
I tend to skip the MiG and INTERCEPTOR, and use only RAVEN and THUNDERSTORM and TORMENTOR. I find the need to actually use RAVEN late in the game, when THUNDERSTORM and TORMENTOR are available, to be the greatest disappointment with fighter designs. I think it should be possible to make THUNDERSTORM usable for light crafts interceptions.
I never build DRAGONFLY, SKYRANGER, and SKYMARSHALL. I find their lack of defensive capabilities to be a great disappointment. In general, I have Kitsune as a general rapid response platform, and AVENGER for special rapid response missions. One Kitsune and one or two AVENGERs is more than enough for the game. There are in general four strike bases, with troops, the fourth having an IRONFIST.
A DRAGONFLY could be an interesting option for insertion into spy missions, but it needs to have a global reach. Perhaps, an upgraded version of it should be considered. The issue of what is appropriate for spy missions is an interesting one, and certainly worth a separate consideration.
I could imagine that slower playthroughs may be actually pressed to utilize Humvee, AH-6, as well as MiGs and INTERCEPTOR, or any subset of thereof. I could imagine how certain playthroughs would end up dangling without the presence of these crafts. So, their in-game presence is certainly justified.
Though I never use the MUDRANGER, since I do get access to OSPREY by the time I need to use a medium strike force (against a mansion at that point in game, usually), I think that its presence is justified likewise to that of Humvee, MiG, etc..
I absolutely love the DARKSTAR craft. I think, that there should be a fully stealth troop transport available. What about giving a special edge to IRONFIST, and making it invisible, and amenable for use in spy missions? The AVENGER would be a troop transport strong with its weaponry whence it could fight off aggressive alien domination mission crafts attempting to intercept, while the IRONFIST would be the invisible one, a more insidious, oceanic, Cthulhu-like trait.
I think that SENTINEL is at best an intermediate prototype, in the same sense that Humvee might be as considered above. I don't see how it would be ever built in a good playthrough : it's not good enough for its Elerium consumption costs (nowhere near the AVENGER and TORMENTOR), and THUNDERSTORM is actually better suited for whatever task that craft could be put on. That is, THUNDERSTORM has enough of hull strength to withstand a couple of hits from the Battleship, and
with a good pilot, it
usually has enough time to shoot its full rockets magazine into the Battleship.
May I inquire, is there a particular reason why a TORMENTOR could not be faster than a battleship? Is it conceivable for it to have speed of 6500?
The list of crafts deemed redundant is thereby:
DRAGONFLY
SKYRANGER
SKYMARSHALL
FIRESTORM
LIGHTNING
SENTINEL (??)
All in all, I think it would make more sense not so much eliminate any of the existing crafts, but to slightly adjust the current ones.
Missiles and cannons are quite different in how they are mounted, so I'm not sure it would make sense to give both to the Thunderstorm. A separate Thunderstorm variant, like you suggested, would be more sensible, but I'd rather make it a different plane altogether, with similar tech level.
The THUNDERSTORM looks like a one of the old strategic bomber projects, e.g. Valkyrie of USA or T-4 of USSR. I think, it's only fitting that it by its nature would not be engaging into a more maneuverable combat that goes along with the application of a cannon. There's a difference between performing an evasive maneuver against a distant missile or beam, and with dogfighting, and also with positioning a craft for a successful cannon utilization. Shooting missiles specifically is much easier. In fact, a craft design for such velocities might make the presence of external pylons undesirable, leaving only the internal bay as the mount point.
I think, there's a good argument for having THUNDERSTORM carry only missiles. What I would like to see, is the ability to have a slightly stronger THUNDERSTORM platform for light interception. Perhaps, I should experiment with dual STINGRAYs on THUNDERSTORM. However, the fact that it cannot have PIKEs while it could have STINGRAYs seems a bit illogical.
I think that THUNDERSTORM fits very much perfectly into its tech level. It's a craft that does not require Elerium, with limited speed, that is good enough to take on a Battleship, but only if supplied with top pilots, additional thrusters, and special missiles.
The presence of cannons on the TORMENTOR is justifiable by it being a maneuverable fighter craft.
All in all, I think it's more sensible to make stronger light rockets available for the THUNDERSTORM. As noted before, the PIKE missiles are essentially a missile version of a GAUSS CANNON, and with effectively less power. The presence of a cannon on TORMENTOR is justifiable by its advanced characteristics, which enable it to both have speed and cannon. A counter-argument could be that at such speeds only beams are feasible, and the TORMENTOR needs to choose between laser and plasma. The RAVEN would thus be the last aircraft to have cannons available. A nice balance decision, reflecting the fact that speed has a cost.
There's no reason why there should be no universal workhorse aerial platform starting after the first third of the game. Please note that the the rest of the crafts, particularly TORMENTOR, AVENGER, and IRONFIST, would have a very special niche role available to them, that THUNDERSTORM could have no hope of replacing.