Allan,
I admire your ingenuity! This looks very clever indeed. I have one idea to add. I don't know if you can order it from Denmark.
It is an aluminum (very lightweight) folding easel made by Stanright. It folds up and can be attached to your box when traveling. When it opens out (similar to a tripod), a central flat platform is created between the three legs where you could rest your box. The bottoms of the legs have prongs that can be folded down to stick into the ground if it is windy. It would only be useful if you wanted to stand up while painting.
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