Was messing around with the reactor planner and got a Mk. I-I-SUC Perfect Breeder that happens to be symmetric. (Or rather I tried to engineer it so that it was symmetric). URL: http://www.talonfiremage.pwp.blueyonder.co.uk/reactorplanner.html?hixsitwbz39v7k4i89929lzzx16uv6wcb623l1vs818fwiznl