There are more pictures of the finished bikes and some videos of them on the last page.
"I just finished making this rim up for my "Muscle bike build off" bike, and thought I would share the process of building a wide freewheel hub. I have noticed many bikes using wider and wider tires and rims, some like the sand and beach bikes would be a good project for a scratch builder if they could get the rims and tires cheap enough, if you build some of these hubs and the following wheel set up and find some used motorbike tires you should be able to do it for next to nothing, depending on what pieces you have available to you of course... The finished hub cost me nothing, I had all the pieces I needed in my bike stockpile, the rim I show later cost me $10 for the car wheels I used to make it, the motorbike tire I will end up using was free from the bike shop, it saves them from paying to dump it. Total cost for the entire wheel, hub and tire combination: $10.
This can even be done without the use of a welder if you are widening by 2 inches or less, if widening by more than that you will probably need a welder to widen the axle anyway. (If you can find the correct endless threaded rod mentioned later, you could theoretically build one as wide as you want without any welding at all.)
For reference a 16inch motorbike or car tire can be fitted to a wide 20inch bmx style rim for the perfect beach/sand cruiser combination!
To do this you will need some knowledge of how to dismantle and rebuild a standard wheel hub.