I'm working on a mod that expands your craft options into 16 total craft from 4 categories.
The iconic Interceptor has been nerfed by being split into two craft, one which maintains the old speed and range, and the other which has the impressive toughness and weapons capacity. The Skyranger has also been split into two options: one faster with a smaller capacity and one slower with a larger capacity. Alternate craft include patrol craft which can help you keep track of what the aliens are doing, as well as other interception or transport options.
I wanted to make some of these craft carry 3 weapon mounts, but I couldn't be bothered to learn Openxcom Extended. This makes the Marauder somewhat useless, though it still sports improved hit points (150) and can carry 2 soldiers whereas the Punisher carries only 1 and the Interceptor cannot carry soldiers.
Most of the craft have some capacity for ground combat and I've made a ground map for each one using blocks from the other craft. I do not have any new graphics in this mod, so there's a lot of re-using ship models and it can get a bit confusing if you use multiple ship types that have the same models.
When you research UFO Construction, you will get the research options for both Firestorm and Lightning, so you can research whichever of the two you want more. Researching Firestorm (New Fighter Craft) unlocks Avenger (Ultimate Fighter Craft), while researching Lightning (New Transport Craft) unlocks Vanquisher (Ultimate Transport Craft). Since all four can perform both interceptions and ground missions, you can select one line and skip the other entirely if you like.
The Avenger, Vanquisher, Stalker, Heracles, Starstreak, and Assassin are all able to take you to Cydonia provided you have researched it. The Starstreak only carries one soldier, though, so I don't know why you'd use that one...
The last four ships are unlocked by researching Mind Shield plus various UFO designs. I had intended to make them into mind-shielded craft but without changing alien AI they already ignore your craft anyway, so it wouldn't even make a difference. So the mind-shielded thing exists only in their UFOPedia entries as flavor text.
Starter CraftInterceptor - weaker and carries only one weapon but maintains the incredible speed and range of the old Interceptor.
Punisher - slower and shorter range but still quite able to catch UFOs in the early game.
Skyranger - faster than old Skyranger, carries 10 soldiers.
Custodian - slower than old Skyranger, but can carry up to 18 soldiers.
Alternate Purchase CraftSparrow - fast, long-range patrol craft with wide range radar which can patrol for hours on the far side of the Earth.
Albatross - slow, mobile radar unit that does not have to refuel very often.
Stormstrike - ultra-fast troop transport faster than the Punisher, carries 4 soldiers.
Marauder - slower but more powerful interception craft.
Alien Technology CraftFirestorm - added capacity for 4 soldiers or 1 tank - Firestorm and Lightning now cost less Elerium to fuel.
Lightning - expanded to carry 16 soldiers or 4 tanks, splays troops out on the ground for rapid deployment.
Avenger - keeps the interception attributes of the old Avenger but carries only 12 soldiers.
Vanquisher - slower and weaker than Avenger but carries the full 26 troop complement.
Alternate Alien Technology CraftStalker - patrol craft that can remain in the air for a long time but travels fast, costs far less Elerium to refuel than other craft.
Heracles - behemoth transport that can carry 32 soldiers or 8 tanks, slowest alien tech craft and costs a lot of Elerium for fuel.
Starstreak - super fast craft that can reach 9600 knots, carries 2 weapons but has low hit points (300).
Assassin - midway between Avenger and Vanquisher, carries the old Skyranger troop loadout.
Let me know what you guys think! I'm also open to suggestions and if you want to provide artwork I might put it into the mod. More pictures and a download will become available as I complete the mod.