The Ecomobile (Eco) has a Kevlar unibody with no steel framing underneath . There are removable engine panels on either side that allow access for servicing of the powerplant.
You might want to look over the patents that deal with retractable motorcycle outriggers. There is some interesting stuff, most notable is the system used on the Ecomobile.
Toward the end of the build life of the Pulse they could approach 20K in price. Machine 327 which is up the road from me cost about that much when originally deliverd (so I'm told).
I've got a KZ1200 I'd like to use in replacing my stock 400cc engine. The new bike has got a shaft drive and I don't think messing with how everything lines up (engine thru to rear wheel) is a smart t ...