Ah man, this has nothing to do with that classic space opera game Ascendancy...

Oh well.
Take a look at Adamant Mod to see how to make separate tech trees for different races.
http://adamant.spaceempires.net/
Quote:
5. People who can tell me how to make certain weapons types restricted to certain sizes of vessel (I don't want Heavy Pulse cannons on a frigate basically) without making them so heavy that you simply can't put them on a small ship.
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While looking at Adamant Mod, examine how Colony Modules are restricted to only Colony Ship hulls via the Colony Mount.