Howdy,
I had a bit of time in the shop this weekend. All the drilling is done on the front and back frames, and they are tack-welded together. I'm pretty excited about the result. They are square and true, and identical. The square and true part is a function of patience, clamping, and always measuring everything three times or more times before tacking. The identical part is easy, since the second frame is built by clamping all the pieces to the first frame. Attached are some pictures if y'all are interested.

Next step is to finish weld these frames without warping them, but that is all planned out.

Attachment 236878

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Attachment 236882

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Attachment 236886

kr