These madwagon frames are awesome for building mo bic's . They are $30-100 on craigslist (company out of business) and have a long wheelbase and good fork, and BMX 4 bolt stem. The rear wheel is weak and needs to be replaced with a heavy spoke wheel or dedicated hub and heavy spokes. People love this thing! Cheap cure for motorcycle fever. ;-)
The seat is still doing great and holding up well. The freaking chainguards rattled loose and the grubee chainguard broke at the engine mounting tab. I threw them away and just ride without them. Watch your pants though!