Black hole generators,
Yeah, they do work... at least when they're put on ships (Though I made them for Weaponplatforms, I tested them on ships because nobody would come after my planets).
Space Yards,
I must admit that I was disappointed to be beaten to the punch by the temporal space yards. Having never tried the temporal racial trait out, I initially thought I had an original idea! Oh well...
I kinda like the space elevator thing, but ultimately (no pun intended) it will be in your mod. The key factor to me was the _repair_ capacity of the station (bringing up whole components from the ground) and the space port/resupply station aspects. The build rate was an afterthought really. How about the space elevator giving normal build rate + boosted repair/resupply/space port, and the cross over facility giving all of that plus the higher build rate of the temporal space yard. Of course the resource cost to build the space elevator facility should come down a great deal.
Orbital Space Yards
That would be good, except that the space stations etc. can be built in non-planet locations. I envisioned lifting components fabricated on the planet into space with relative ease and speed. Improved Space Yards in deep space seems counter-intuitive.
my $.028 (Cdn funds)
-jimbob