Here's one I prepared earlier, and thanks for the prompt to finish it off.
S is 200mm centres. Works well with wave fins left in, but slalom fins removed.
D is 600mm. My widest board is the Fanatic Falcon at 71cm, but I think D=600 would still work fine for wider boards, e.g. 80cm.
H is 1100 to the centre of the back panel. I decided on an H that will fit between all front footstraps and each deck plate.
Edit: Bugger, second photo is still rotated. Sorry 'bout that.