This is something I made up quick and has worked well in 3 boats so I figured I'd share. It's an outrunner motor shield for 28mm can diameter motors, to be mounted to the top of a Battler's Connection new style pump. It uses 3 of the existing pump top plate mounting screws to secure it to the pump body. It also has an L bracket built into it to mount your brushless pump ESC straight to the pump. There is a cut out for the brushless motor wiring, make sure you clock your motor appropriately.
It's not fancy, I made it in about 15 minutes, but it works.