Kuno if you look carefully at your photo B (third from top) especially the LHS door pillar. At the top are two holes where the bracket the same as the one showing on the opposite side is missing. Apart from those holes there is no indication of other fixing places for hinges and to me those top brackets may have been the clip to hold a canvas safety strap which some doorless vehicles had.
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Cheers
Cliff Hutchings
aka MrRoo S.I.R.
"and on the 8th day he made trucks so that man, made on the 7th day, had shelter when woman threw him out for the night"
MrRoo says "TRUCKS ROOLE"
