Coaster brakes have their place, but I agree with you about using them on a motored bike. I'm just looking for ideas about what to use to make a good connection between the hub and the clamshell, sizes available verses what is available for the clamshell. There does not seem to be a standard, and no one is saying this is what you need to do, but they all are saying "this is what I did."
If I have to build a wheel for this, I may as well have a slot milled in the hub and the clamshell to accept some 1/8" key stock. That way, if I ever need to adjust the chainline it should be a simple matter of loosening the bolts in the clamshell and repositioning it.
