[henk brouwer]

I personally liked the way spaceyards worked in SEIII. (I hope I remember this correctly) you could buy as many ships as you wanted in one location in a turn, but they had to be repaired by your spaceyards. They would start out as empty hulls with 100% damage, repairing them could take a lot of time. When your spaceyard was attacked you could try and defend it with your half-finished ships, in the SEIV system you'll have to wait until your ship is completed before you can use it..