Hi Ben

You can get those plastic rimmed wheel barrow wheels that are about 5-6 inches wide, punch out the bearings and file the taper out to slide in an aluminium axle (50mm dia) an put a couple of keepers each side to hold it in place, and attach the cradles to the axle.

I was what Alive is showing, I saw in Melbourne recently, looks like they would be good for soft sand type beaches especially, better than the barrow type wheels.

But the above is a cheaper alternative, when moulding cradles, wrap some glad wrap around the hull where you're working, lay a thickish layer of newspaper on the hull, this will allow for the padding on the cradle, another wrap around with glad wrap, and glass up your cradles with chopped strand mat. You can get from your disposal type store or toyworld foam mat squares that clips together, its blue or green, a pack of 4 mats about 2ft square cost about $25.00.

Just some ideas, or just buy the cradles from AHPC/boyer, thats what the apprentices get to hone their skills on, and you sometimes get seconds.

Regards

Matt