Well. Not sure this is that unusual, but it seems most people don't even consider equal sided reactors:
6x6x7
http://br.sidoh.org/#reactor-design...controlRodInsertion=0&layout=G2CGC2X2C2XCG2CG
8x8x7
http://br.sidoh.org/#reactor-design...ion=0&layout=2G2E4G2C2GEC2XC2EC2XCE2G2C4G2E2G
http://br.sidoh.org/#reactor-design...dInsertion=52&layout=G4CGC4X2C4X2C4X2C4XCG4CG
6x6x7
http://br.sidoh.org/#reactor-design...controlRodInsertion=0&layout=G2CGC2X2C2XCG2CG
8x8x7
http://br.sidoh.org/#reactor-design...ion=0&layout=2G2E4G2C2GEC2XC2EC2XCE2G2C4G2E2G
http://br.sidoh.org/#reactor-design...dInsertion=52&layout=G4CGC4X2C4X2C4X2C4XCG4CG