The one I am making will function the same as the one Unabiker made, I'm just going about it a little differently.
I sourced the junk 100 pound gas cylinder from the local gas company. I just had to pay them 10 bucks for them to "devalve" it.
The drive shaft will go thru the "gondola" under the tub. The flange mount bearing (2 ea) will mount up to the 4 hole bolt pattern.
The support frame that the tub will sit on top of will be 2x2x.125 steel tube.
I'll have the tubing Monday...stay tuned.