Frankie, i think that's a great idea. I have thought of doing something similar, but have the back plate and the outrigger plate hug the frame with plate steel and then have a 90degree piece/tab through which you would drill a hole and pass a bolt through. THen the entire slider would clamp around the box frame.
[] except have a tab on the upper part and lower that a bolt passes through in the same plane is your pictured example.
[] except have a tab on the upper part and lower that a bolt passes through in the same plane is your pictured example.
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