I mean, I get what you mean, and I kinda want something like this too, but ship balance is really precise and ship's rolls are pretty well defined. You should know this as a (damn fine) competitive pilot. In my humble opinion, this sort of thing would add a bunch of half-breed ships with no real purpose.
Edit: This does sound like a lot of fun, and I'd be 100% up for this in co-op, but for PvP, I can't see this working