For the roof I used 1/4" ply. The rear section (already done in picture) required one brace from side to side. Next decide where the vent will go in front. I decided centered, using the existing brace. Build a square 14 1/4" big. Note the directions with the vent say 14" but to do that, double the braces so the mounting screws have something to bite into.
Trial fit of vent.
Glue and staple the front section on. When you cut out the roof make it a little larger than necessary and sand to fit. The hole for the vent I cut out with a router and a trim bit, that is till the bearing on the trim bit burnt up, then I used a jig saw.
Sand the roof to fit, and fill the cracks with fiberglass.del
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