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Re: wheels
we have made 6 inch wheels out of inch thick ply (25 mm) then sticking three of them togetehr and covering them in rubber using a mould. This is very heavy for a wheel but you can cut out the middle, or use a thinner layer of rubber....
we did the same this year but we used 8inch wheels .... we had too much weight and grip and had to replace two of them with castors ... we couldn't turn as they had tooooooo much grip....
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I am an ex-member of team 759.
759: regional winners with 522 and 233 NYC (2004)
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