Also George's Bell housing was way too heavy. The best his foundry
could do was about .25 inch thick. Speaking of that my friends
at Mazdatrix told me the way to get a cheap, light weight, high
pressure die cast bell housing is buy the whole transmission!
2nd gen transmissions are  going for $150. Buy the transmission,
disconnect the bell housing and throw the gear box part away :)

Paul Lamar ...No rotor no motor.

Paul and Bill,
All too true I'm afraid!
I gave it my best shot and spent months and many dollars to prove that the
problems are insurmountable for low cost, low weight, high strength
aluminum castings.
If I went through the problems encountered you would all get a headache -
still it was interesting and educational.
I suggested to Bill we should get a group( Co-Operative) together to fund
the parts manufacture.
Interestingly Taiwan ( being the second best aluminum casting preference
after Japan) would amortize the cost of the patterns if I purchased
thousands. They even offered to store excess stock for me - good of them!
The cost of aluminum is the same world wide, so other costs are in labor.
If you look to the western world to manufacture, the pattern costs are- as
Bill suggested!
Just can't see a solution without big money!
George ( down under)

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