It was in Konigswinter just southeast of Koln.
I've noticed that this type of setup is a very common part of a dining suite in Germany called a 'sitzgruppe'. So it will have certainly been bespoke and in some ways has alleviated me of the disappointment of missing it. In my head it was 3 structurally independent pieces, but judging by this German norm, it was most likely not a dismantling setup rather a bizarre corner shaped Moller bench!
I really dislike the corner seat itself because of the bizarre way it distorts the backrest, but I love the two benches.
Still, to have owned it for the oddity would have been very satisfying.
Kyle---you'd probably have to attach extra warp strands to the side rails and somehow work the weft strands in there so that it looked ok. You can do a certain amount of fanning out of the warp strands from a shorter back rail to a longer front rail, but not as much as would be needed here.
I think these were probably upholstered originally, though.
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