[mac5732]

I know it takes time, the best way i found to replace them is if you have a good number of shipyards and 2 or more in a system, only dismantel 1 per system at a time (depending on how many you have) and build 1 temporal yard per system at a time. This way you still have the other yards for production until you eventualy replace all the old ones. On new planets just go right to the temporal yards,, don't even bother with the regular ones. If you have a lot of yards in a system then you could could do more, but don't dismantle all of them at the same time or you won't be able to produce or repair in that system. Good luck and enjoy

just some ideas mac