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Yeah, looks like in terms of dimensions it's almost identical - only a few differences, eg as you say, the height required for the extra hand, and a larger centre hole in the dial.
Some kits here already I see
I’m guessing the movement would fit in a 40mm case or smaller. A fully custom, say 39mm GMT (maybe without a rotating bezel) using that movement would be super interesting. If Seiko supply it as an NH series calibre (edit: they do), some microbrand could make something killer.
Also wonder if you could just transplant the movement, dial, chapter ring and hands into an SRPE and get a 40mm GMT. I’m guessing not (edit: you can, but not with the stock 24hr chapter ring, plus you need a double domed crystal).