Well, I suppose that this is the only Tiny Trailer with a 1920 REO door. (My best guess is that it is a late teen, early 20s REO part, any help on that ID would be appreciated).
So, it works! The frame is complete structurally. The latch works. It is cat proof, although not bug proof yet. I’ll be working inside now to strengthen the side wall and build cabinets and fill the missing ‘window’ areas left from the door installation.

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And, a view from the inside with the door closed.

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Yes, I’m having fun. I can now just turn the handle, step on the little step below the door and enter the trailer. That will make continued interior work MUCH easier. When I went out to take pics, it was about 40 degrees outside and 70 inside the trailer. No extra heat, no insulation and lots of holes left. This should make a fine little mobile ‘home’.
Lots more goodies arrived today, including the battery charger. Batteries (two group 24 gel cells) should arrive next week I hope. One plan includes a large solar panel on the roof as a ‘desert shade roof’ type thing. I have panels from 85 to 200 watts available. I’ll have to pick something appropriate for this tiny house.