now now, no reason to be so harsh...we don't know the skill sets his friend has...
Dustin there is a DIY 144V (144V nominal so ~158V max charged) 500A controller available from Paul&Sabrina for 600$ (http://www.paulandsabrinasevstuff.com/store/page3.html
Your friend can start there, build that controller up, and then expand on the control and power sections to enable it to handle more voltage and amperage...I also heard that Paul has already started on a 1000A option so you could email him and they might sell you the kit with parts for the 1000A version...
Even if the 1000A version was 1000$ from P&S.com you could deviate from your KISS method, get two 1000A controllers for 2000$ and get two Warp9 motors for 3800$ = Total = 5,800$ vs. Soliton1 3000$ + Warp11HV = 3600$ = 6,600$
Jack Rickard's Dyno shows Warp9 delivering 250ftlbs of torque with 1000A which would be 500fltbs with dual motors & controllers!
Warp11HV would deliver ~300fltbs w/ 1000A