fatdaddy: looks damn good. not to reply to stuff you said a few years ago or anything, but yeah, the mount from ebay (Barry's one) is what I got. two very heavy bolts straight through the bottom tube holds it all together. the actual mounting plate that touches the motor has a little pit of play back on forth to allow you to tension the chain. In my opinion it is a great design.
this thing was put on the market literally days after i ordered mine, might have gone with it instead. that said Barry wanted fewer dollars for his mount and it came with an exhaust pipe too!
brown: that site has almost become pornography to me. i have been oogling those seats and posts for moths now. the only thing stopping me is cost. i have a near-to-no-cost idea to attach a spring to the existing seat, if that fails i am getting out my wallet.