I was thinking recently of copying the Ross design as there are now about
a 1000 out there in every day service if you include Tracy's version.
That is lots of hours and experience. The R&D has been ongoing for
almost 50 years. Why reinvent the wheel. If it is not broke don't fix it.

Not rocket science. The incentive is I recently found a low cost machine
shop in Ventura with big enough machines to make any of it at relatively
low cost.  I also found a heat treater near by. Two critical suppliers.
The case will be tig welded thick wall aluminum tubing machined after
welding.

Ross cleverly used hardened and ground  2 inch OD DOM tube with needle
bearings for the prop shaft. This saved a bunch of weight.

The Ross was 10 pounds lighter than Tracy's Chevy rear axle
version. It also does away with the spline on the prop shaft
which is a source of some of the back lash on Tracy's version.

Jeff is already making adapter plates with built in motor mounts.

I would start with a 3.17:1 as that gives the most power
with a 72 or 76 inch efficient prop.

I would use our new silicone rubber steel welded coupling.

Paul Lamar