Thanks Egor...for the help. Thought that this would be an easy buy for the sprockets. I was going to go with a typical bicycle jackshaft setup that they have ben using forever on recubents and now adays on wide rear tire bikes. I had already bought the 3/4 inch jackshaft and wanted to stay close to what the guys were doing so I could help give them anymore input on their project....so going to have to make a choice. The freewheel crank on my schwinn I bought is pretty cool and I have found many parts and pieces so with a little looking anyone should be able to get one of these cranks without spending 150 bucks for them. I bought the whole bike for 80 but most was shipping...also about the cranks it looks like they will go on any crank arms because the bearing screws on just like the cone does. I found the bearings and sprockets for less than 50 bucks on ebay.
Terry