"Gauss Missile Defence" - I don't think it has any missiles.
It should be just "Gauss Defence", just like "Laser Defence".
why not, the main idea is to propose a defensive building at this stage of the game.
Improved/Advance Gauss Weapons are just stronger, right? I'm okat with this, but I don't know if it's technically possible; I'll have to consult an expert. 
Attention, only clips ! The weapons are the same one. But maybe, we can make explosive bullet for Advanced (fusion) Gauss Clips and incendiary bullet for improved (plasma) gauss clips ... ? Or we can maybe forget this and give only standard clips ?
Then, there are plasma/fusion weapons. If they are available too early, then it's all for nothing; they must be more difficult to obtain. One live alien is not enough, but what else?
...and today I discussed it with Dioxine, and we have a plan! Listen to this:
Each alien Engineer you interrogate gives you one random tech, using the "get one free" feature in the ruleset (the same that Medic uses). There are a number of techs available to choose, let's say there's 10 of them. These techs are free - you get it right after researching the Engineer.
In order to get plasma technology tree, you need five different techs from Engineers. Therefore if you are very lucky, you can have them after interrogating 5 Engineers, but you're probably going to need more until all 5 techs are found. It's the same for fusion weapons, although some techs may be the same as for plasma weapons.
Other techs may lead to other things, like lasers or whatever.
This has a number of advantages:
- Advanced alien weapons are delayed.
- You get empty techs, but they're cool.
- There will be more cool articles in the Ufopedia, covering technical aspects of alien technology.
What do you think?
I like this ! If it is possible technically I think that it is very a good idea (I read somewhere something about that ...).
Also, seeing as Gauss weapons seem to be accepted into the mod, I'll add them to the Firearms Compilation.
Great !

For the future, I hope someone create the sprits for saber laser ^^ Finnaly, It's the heat-ray who give me this idea.