Oops! Made my decision while I was out picking some stuff up and grabbed some 3" exhaust tube for the hole sleeves too!This ones got my vote. Cool idea.
Just finished drawing out the templates for one side on some 1.6mm/16 gauge sheet, once I confirm it all works I will cut the other sides.
There will be two plates on each wheel separated by 1/2" or so and joined by tubing sleeves through the holes:
My biggest problem now is that I don't have a 3" hole saw or plasma cutter or even an oxy set up, so this will be all done by hand grinder and half-round file... Not really looking forward to that!
Luke.