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Although you can’t really see it, the table was marked up with the dimensions of the top of the aft fuselage box. I then set up the side panels on the marks upside down. I have seen other people make the box upside down and it makes sense, because the vertical channel pieces are square with it.

I then started to grossly fit the upper and lower cross ties (lower on top because it’s upside down!)

After this was all done, the pieces where only in an approximate location.