Has anyone ever tried buying the military of some empire like the Dregin? Just offer to pay a bit of money (depending on the map size and your reserves) for 50 months plus give them all your tech and trading goods. Then you could take over their empire with their own ships. After they're dead, disband the stuff you don't need. I tried this before and it worked perfectly. I took over their entire empire for only about 10k (large map, normal level). I did have to position a few of my own transports around their planets to help take them over, since they didn't have enough themselves. Someone should probably make a mod to stop this because it makes taking over an empire cake. All you need is a little bit of cash. The other nice catch about the dead empire is that you don't have to pay back that nice 50 month loan.