My first design (first gif) has proven to be less than ideal.
The problem is I can't get my head far enough inside to see
the weld with my bi-focal glasses  due to the size of 
the welding helmet and the diagonal braces. I can weld some 
of it but I will have to take the motor mount out of the jig 
to finish welding it.

Here is my suggestion for model two. Make a sketch and take it
to your local welder and have him cut it out and welded up.
Lot easier for him as he probably has a cutting torch
and an iron worker. 

This is an inside out jig. The six inch
diameter steel tube is torsionally rigid so the 2 inch by 2
inch by 1/8 angle are held in the right positions.
Then the firewall and rubber motor mount 4130 steel brackets are
bolted to the ends of the angles. This way there is plenty
of room around them for welding the 4130 motor mount tubes.

A true universal design would have telescoping tubing so the 
length could be adjusted for any position of the rubber
motor mounts on the engine.

Paul Lamar
 
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