I made ugly square doors for my TD, they leaked
I ended up making a round topped door like I wanted, but still had it closing against the outside of the TD, this was still clunky.
I finally set them into the sidewalls the way they should be for sealing, aerodynamics, and looks. with a inner frame to seat against and a nice gutterover them I'm finally happy with how they look, the TD looks much better, and it should never be able to leak.
It only took me four tries.
I also dscovered RV sliding windows are heavy, expensive even used, and when open, only about half the window is really open.
On door try #4 I made a Wiley window instead. I wish I had the first time. the screen is cheap and glued in with RTV, the window "glass" is a plexiglass in the size my local HD stocks in .221 thick 18x24". with the glass tipped in I have the same opening as the RV window, and no chance for rain to come in, when the TD got too hot camping this past weekend I took the glass out and had the whole window open.
pics in my WWW