Johann, thanks for the reply. Those dimensions look to be for the drop boards. I also was looking for the size of the horizontal section, since I was trying to protect the entire companionway opening. Last time I stayed on board in heavy rain & wind, a small but annoying amount of dripping creeped in around the edges.
I went ahead and banged together the project using a heavy duty plastic tarp & 3/8" snaps to attach to the same posts as for our pop up "tent." I found a green tarp to match our general color scheme; I really didn't want to resort to blue, silver or brown. The whole cash outlay was less than $30.
In part, I went into it knowing it was probably a dry run -- no double entendres intended -- for possibly making another out of sunbrella next season, but with the price of that fabric, I wasn't going to guess on how much material I would need. So I just got'er done for now and tried to keep it cheap.
To share the data I needed, the width to cover the horizontal section was 45" and the length was 64". The drop board section narrows, so I needed to fashion a triangular section before dropping straight down to above the cockpit seat. The bottom of the opening is 33" wide and its height was 18". All the dimensions take into account additional room for the snaps.
I still need to install snaps on the vertical section, both in the cover & the posts into the fiberglass. However, I decided to wait until tomorrow & daylight. I really felt an imperative to finish the horizontal section so I could strike the extremely cheesy silver tarp I had temporarily rigged today as a boom tent. My green tarp/cover is still kinda cheesy, but it's getting the job done & doesn't look completely horrible. (Though maybe I'll feel differently when I see it in daylight!)
I'm sitting in the cabin now with the cover in place, listening to the rain harmlessly bouncing off it & the wind howling but no sound of fabric flailing. Better still, even though a gale warning is in effect out on the water for the weekend, it looks like Joaquin will stay to the east and its winds will only brush by us. Whew!
