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Moving right along, here is the next former already in place.  I just pulled the frame forward some more.  This time, it was a lot more cramped and the height was a much tighter fit.

Also, the CG was much closer to the edge.  The frame is very light however, and just setting a steel plate on the aft end was more than enough weight to keep it stable. The fit was tight enough that I was the clamp that kept the whole thing from moving forward of backward.

Only one more to go.