I bought some angle steel from Wickes, cut it to size and welded it up. I've fixed the motors in place and tested it with a couple of cheap RC speed controllers at 11.48v. It works, it's not super quick but probably fast enough to get around the tiny PiWars arena.
The current set up doesn't make any use of the mecanum feature which requires a little more complex motor control, easy enough to code, but not so easy to test with just a two channel RC setup.
I've put the wheels on in the correct orientation (the lobes point to the centre from each axle) and weighed the setup... 1.3Kg
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