It's been a while since last post, but I really like the idea of a shipyard. The design looks rad.
Yeah, it will basicly fill the role of spawning ships

So instead of SB doing it, SB will be a defensive role only, and everyone will start with one shipyard.
Shipyards will be tough though, though there not super tough in retrospectives, sometimes you have to bend the rules a tad when everyone relies on a shipyard to spawn ships rather then planets. Planets will always spawn them at a slow rate, depending on population and shipyards will spawn them at a high rate, depending on the population in the shipyard (which is scaled different vs the planet, it will be something like 20k for fast spawn, etc. )
I'll probably have it so you can set a 'inital' population on ships but eh, we'll see.