Perry, I have had good luck with the mud buddy quick flip. I have had mine on two differnt 16'ers one a v -hull and one a mod-v. When I went up to the 18' I had to buy a new cover.
If you're interested in the cover I had on the 16'er, I was trying to sell mine. You'd need to make up a new frame out of conduit, but it wouldn't be a big deal, especially for a man like you who can build entire boats! I can provide pictures and dimensions for the frame. Drop me a line if you're interested - I can't remember what I was asking, I think a couple of hundred $$, but I'd consider interesting trades too.
Charlie