Update:
We have prototyped a square configuration 6 wheel 3 CIM ball shifter VersaChassis WCD. Haven't done AB comparison driving with our AM14U since it's the summer holiday. Will start AB testing in a few weeks once all the students returns to school.
Our team has made a Step by Step guide to building the VersaChassis. Hopefully it will help anybody who wants to try something different than the KOP AM14U.
http://www.chiefdelphi.com/media/papers/3050