Hello Jim, welcome. I am very interested in what you have done with the mounts. The problem with those is that they were designed for 1940's English bicycles and never reworked to fit modern, larger down tubes. (The portion of a bicycle that leads up from the crank housing to the handle bars/forks)

This spring I am launching a line of 50cc bicycle motors and the mounts are to be a double "V" with a flat bolting piece in between the V's so as to fit any size tubes and angles. Or suspend the engine from the top tube and have the twist arrested with a bar below.

I mention this as I will likely need a good fabricator and your clutch housing looks great !
For the green, tree hugger bunny lover consumer, I am also experimenting with propane conversion kits. Thats just fun. Would make a good sized hole and dark spot if some thing goes wrong. snork.

There is soon and already a growing market for these bikes and it really will help folks. So it is the good fight with profit. Win / win.

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Ilikeabikea; He'll build a motorbike with a wing
It will be a magnificent thing
Underneath is a boat
So that it will float
And riches to Dan it will bring.......