Ok, I have been trying to remember some of the dimensions for you. Here is what I have.
The tubing is 2x2 the top rail on the cart is 24" off the floor with a 36" crank center line (I'm 6'6" tall). I am fairly sure the cart was 36" long. The slots are about 3" long. The bolts through the rails are 1/2". I am fairly certain the cross bar is about 40" but you would only need it to be this wide if you planned to use a front plate for mounting (like the engine in the picture).
Chris
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