In case it isn't clear from the pics the wiring sequence to the motors from the HL bord is as follows:-

Red to Purple
Black to Green

Red to Brown
Black to Blue

Now that I have the Leo in bits I am tempted to fit an airsoft unit while retaining the gun recoil system which is very realistic. This will still leave plenty of room for the HL boards. The turret is 10" long, 6.5" wide and almost 2" deep.