Neat!
My brother designed and build a couple lower power 4 channel speed controllers for our underwater robot last year....featured in the Feb SERVO magazine. He came up with a new design this year called
ROVotron, which includes the (tethered) control system, which is user configurable using a menu system, navigated with the PS2 controller. I think most of the information required to build it is on the web page. The software is.