(Welcome to the forums boyo!)
Thanks, glad you found somethings useful. I didn't realize making more mount types was an option, but actually I quite like that idea. While I accept that it's limiting, in 40k different types of technology just don't mesh very well. The only exception I can really think of would be Orkz, who are a quite glaring one. Aside from that you might find a particularly radical (heretical) inquisitor or rogue trader mounting a captured eldar weapon or system, but that would be about it. I don't think the compromise of only being able to buy your own race's equipment but having the option to use captured stuff (As in Uomoz's) is that bad, though, for people who would want to use that option.
Speaking of Uomoz, as mentioned it did have some useful things in it. Choosing your faction and getting an appropriate ship, for instance. I also noted while checking out the races that the Antediluvian (?) ships came with weapons and everything when you purchased them. Might be an option to consider for people who want to use the 'official' versions of the ships without hunting down the right weapons and stuff, while still having the option for customization later.
Pros:
-Very low Fleet Point cost
-Quite good armor.
-Lot of weapons mounts (with 3/4 of them pointing forward)
-Very fast rate of fire, but inaccurate and short ranged weapons
Cons:
-Slow and unwieldy
-Low ordnance points (all of them would be used ot fit weapons)
-Low flux capacity and venting
Gonna actually pull up the living rulebook and see here. Never actually played against anybody who used orkz in BFG! Yeah looks pretty accurate. While their armor is probably some of the best, along with the Imperial Fleet, it's worth noting that their rear armor is very weak. Maybe just make their engines more vulnerable to being knocked out to represent this in Starsector? I think the only other thing to point out for the race as a whole is their bonus when using the all ahead full order, would probably translate pretty easily by giving a lot of their ships Burn Drive (a.k.a. 'Big Red Button). Also worth mentioning is the Ram ship. I don't know if it's possible, but since I don't think the A.I. would ever bother actually ramming with them, maybe you could make their special ability work like Burn Drive but always move towards the closest enemy ship or something?
In general, I'd say I agree with your assessment! The more I think about it, the more I like the burn drive on ork ships. Making them slow and very dangerous at short range seems like it could just make them bad, but if they had a hard to use way to (maybe) close the distance it could make them dangerous, and would also make battles involving orks feel more chaotic with ships flying all over the place and running into eachother, more than likely- Which is the way it
should feel whenever orkz are involved.
Can't wait to see a hulk in action! Man, those things have a lot of guns...