This is the map i have designed:

Each team has 1 choke point near the star so make sure you capture that planet as fast as you can. Ive played this game on hard and the enemy builds and upgrades star bases in the choke point planet ive encountered Argonev star base with more than 12k hp and mines all over that place i had to back out, i recommend playing this map FFA with 4 players in hard mode it will be really challenging and fun, also the artifact chance is increased to 25% to encourage exploring planets,

Map:

http://www.sendspace.com/file/vlem2v

 To install it for rebelion copy the map and put it into my documents/my games/ironclad/sins/ galaxy forge