Man, you gotta love this stuff from the Co-built guys! (Anthony and Geoff) - Top Quality manufacture to rival anything made anywhere!
Main product is traditional twinshock Flattrack 'Framer' race bike chassis to fit a Rotax motor and your choice of forks/wheels. Just look at those yokes, cool.
They hand make my exhaust systems and silencers for me too, all out of stainless steel.
Best of all you can buy it all right here (see price list pic).
E-mail me you requirements or to ask any questions.

The rest of pics are from Anthony at the races on his Co-built framer.
(see shorttrack uk)

Just been out on the Co-Built bike at Rye house for the day (thanks Anthony) and what a bike that is, by far the lightest Flattracker i've ever ridden and feels planted everywhere - and it was pretty wet out there!