UPDATE
Small progress report, but progress just the same.
I mounted the toggle clamps today. Here is a pic of the plates I used and the toggle clamps before welding and mounting.
The mount plates after drilling and welding the 1/4" nuts in place.
Here are the toggle clamp plates welded in place. You can see in this particular picture that I have a Vise-Grip located under the motor base. This is to best locate where the toggle clamp mount plates will be welded. In this location I allow enough adjustment to allow for varying link belt lengths and belt stretch. I will weld angle brackets on each motor base for the toggle clamps to push on. I did not have the angle I required today.
Both grinders with toggle clamps mounted. I spent a short amount of time catching up with the third belt grinder today.
I apologize for the fuzzy pictures, I used my daughter's digital camera today and I am not familiar with it. The next update should see the pillowblock mounts installed, nearly completing the larger portions of fabrication.