I made these for a Century Grand 5x7 and the folds - taken from the original (completely shot) bellows were about 10mm. I actually found from careful measurement of the original support struts (which seem to be made from thin varnished card) that the measurements alternated 11mm / 9mm / 11mm etc. from back to front standard.
If we take that as a guide and given that you think 1" is too big and 1/2" is too small, doubling mine (for 5x7 up to 11x14) would be 20mm roughly, or near as makes no difference 3/4". I'm remaking them now - that's why they are off the camera - and still looking for the ideal material! Currently trying bookbinders' reconstituted leather....watch this space.
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