I have oft said that even though we use this regularly it will never be finished. The latest improvement to filter to the top of the list is putting some wiley windows in the doors. We have been camping with them wide open for good air but that meant hanging an old fashioned mosquito net inside. Great for an instagram moment but a bit of a pain in practice. So some windows with fly screen are in order.
I thought I understood the concept reasonably well but I was not confident enough to hack into my nice doors straight up. So I spent a few hours making a 1/3 scale mockup. This let me confirm my understanding and try out an idea to avoid needing drain holes. I have a routed a 45deg chamfer on the bottom edge of the opening and continued that angle on the backing piece.
It also allows me to confirm that the frame can be a different height on either side to accommodate my D shape door and opening.
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