Thank you! we will weld the plate on the bellhousing. Using again the thin sandwich plate as reference.That's going together very nicely!
I'm very impressed- that's a LOT of work.
It's odd seeing a flywheel with no friction surface...
One suggestion with the starter- use a plate or a ring for a spacer.
It'll be harder to fabricate, but the starter really needs the support
from the full flat surface, so the bolts clamp it and it's solidly supported around the perimeter.
I've had them fall off race cars...