@Gavin I think I'll do some readings this weekend and maybe make a project of it... Interestingly, the angle of the pedal used in the Conn organ for sitting position doesn't seem well suited for a 'today' project and I'll be changing that. At first I thought I'd simply drill a new hole and make the long linkage shorter <edit: longer to make up for shorter arc stroke..?), but now see they have a number of pot position options. So cool!
pic 1. full open
pic 2. full closed
pic 3. midpoint and comfortable