Second: back to the ForkenSwift.
After a too-long delay, Ivan and I spent an hour on it this morning. Hopefully the inertia will carry it along a little more regularly now that we've started on it again...
The adapter plate is now drilled and attached to the transaxle (the Blackfly's old transaxle - which is, of course, identical to the one in the blue ForkenSwift which will ultimately be used).
So we're officially at the most critical engineering stage: choosing a motor/transmission input shaft coupler design, and implementing it.
The parts we have to work with are the splined male hydraulic pump shaft (fits into the motor shaft), and the splined "hub" of the clutch plate that fits on the tranny input shaft.
One option that I know has been used is adapting a Lovejoy connector to mate those 2 (dissimilar) parts:
http://www.lovejoy-inc.com/jawtypecouplings.htm