The design was pretty low tech. I used Masonite cutouts of the bell and transmission overlayed to come up with the shape. I probably left more than the necessary amount of material at the perimeter but what's a few extra lbs for peach of mind. The transmission mounting surface is a-symmetrical but I made it symmetrical so if the shop messed up with the pattern it would still work-a little extra material. The machine shop did an excellent job with the fitment of the bell and output shaft. A light tap seats them.

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT