Captains and Governors

[Suicide Junkie]

All those suggestions are doable. The only thing wrong is that concentrating the cost into organics and radioactives will not increase the build time.
For any ship in most mods, the only construction bottleneck is minerals.

Making the specialist crew components use organics and radioactives much more than minerals is a good idea.

The one per vehicle restriction is important, and I suggest complementing it with the "can't be repaired" ability when the next SE4 patch comes out.