I used to buy clutches and some other bits from them, not frames or engine parts though, I think they did buy some 90mm Cosworth pistons from me.
One of their nicest bits was rearsets, footrests bolted into tapped swingingarm pivot studs, I ended up making more the same in UK . think I may have a set lurking. use Ago type long lever on box output, tie that to gear lever with rose joints. Alloy levers and pegs, levers bushed on peg bolt.
Simple, elegant and light as possible. Perfect spot for pegs on a racebike
Guess they used same on their own frames ?