Quite lengthy, not all comprehensible right now (Need to catch up on sleep....again).
I quite agree. Good thing this is a proposal. NO TECH POINTS. Please. Any name but "tech points". Illogical and silly-sounding. We might be a cubic sci-fi game with vacuum energy, but no "tech points". Perhaps instead just have chambers require...I don't know...power? Since both these silly, incorporeal TP and power are generated by the reactor...Replace the functionality: Chambers require X power to function per block. Chambers receiving sufficient power require X time to charge to functionality. No shipyard-spammed ships straight into the fight anymore (But seriously, how often would you have to charge up the shield recharger subsystem? ONCE!).
Next well-meaning criticism (I actually like this proposal in a lot of ways): Why not allow multiple reactors? If I want to run my weapons off of one, my thrusters off of another, and my well-armored jump drive off the most heavily armored smallish reactor ever, well, why not? If reactors can be made a bit more efficient at larger sizes, there is a trade between "well-protected subdivisions" and "absurdly large overengineered self-destruct button with excess power".
Why stabilizer blocks? Why not stabilizing crew stations instead? For now, I'd revamp the stabilizer system like this (Until crew is properly in-game): Stabilizers must be between .05x (Random number pulled out of the void) and .25x (Another number from the void) distances away from the reactor, where x (A unit of "distance", in my simplified example) is the number of blocks in the reactor. In other words, there is a zone around a reactor where, eventually, your "reactor techs" will work. For now, though, stuff them with stabilizers. Not ideal, but it provides for what should become an interesting system later. Not too close (Radiation!) and not too far (Can't physically reach the stuck valve? Well, that's too bad. Hope your Space Life Insurance was paid up). Other systems could be made efficient in the same way. Crew members within X distance, but outside of x distance.
Then, perhaps you could add some sort of remote-control officers (Not near the action), but that's probably definitely a separate suggestion for crew.