Hey, I had attempted this kind of set up about 2 yrs ago, except I used trampoline frames, attatched to pvc pipe, and had it suspended by a set of nylons rolling on a bbq spit motor. It was about 5 ft diameter x 4 foot long and dipped into a kiddie pool. (I know it all sounds a bit far fetched) I wish I had pics but, hey I was super paranoid. Just so you know, those bbqspit motors, can reverse on you if the power flips, and the axle is not very strong, so don't try to direct drive it. You will need to come up with somewhat of a chain or belt drive, and make sure the weight of the wheel is not supported (in any way) by the motor, or else it will eventually bind up on you and fail. The only thing I could not quite get around was that it was really difficult to get it to track right. Plus if you use only one motor it will try to torque the wheel on one side, and will misalign the entire thing. good luck though. I also was trying to use parts that were easily accessible and would not be noticed by my neighbors. (nosy bitches).