I have a sag in the front on my Hunter 1 (Compact II). It is right in front of the pop-up, but I don't have any cabinets inside to support. It is over the table in the middle. I do like the 1/2 tube ideal. But I also thought of a brace on both the inside and outside.
My Compact Jr.
had a sagging roof along the left, or street side (Port side for you sailors
) This was because it was gutted when I bought it, and the wall between the galley and the bunk was removed.
I had never seen an intact Compact Jr.
before I went about replacing the interior, so I did not realize that that wall would have supported the roof for the Compact Jr.
's full-length pop-top. I left it out.
The opening for the pop-top had a [b]4" high lip all the way around, to the outside of which I bolted a 2" x 2" x 8' angle iron along the two sides for strength. The fabric covered the angle iron on the outside.
I was thinking about you adding an angle iron stiffener around the lip of your pop-top...