We cut and mitered the final section of square tubing for the motor mount, and bolted the full assembly to the frame rails. We discovered that the rails ware not rigid enough for this design. There was quite a bit of flex at the back end of the motor. Fortunately, the solution wasn't too bad.
A vertical section of square tube was welded to the motor mount arm, and bolted to the frame rail. Attaching in two places, at 90 degrees was a big improvement. The effective length of the arm that is cantilevered out to the motor is shortened substantially, and the load is spread across more of the frame rail.
Here is another view from underneath:
The view from the back isn't too bad either.
Once we get a coat of paint on that bare metal, it is going to look like the motor mount was original to the vehicle.
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