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No problem for the dimensions of the SSP1, I will send you annotated photos with the dimensions and I even thought I would remix an existing hicapa to have the dimensions of this replica and thus be able to make the modifications on all the kits and other accessories.
PS: I have seen your picture of the V2 and personally (from my point of view and in all subjectivity) I find that the foregrip/magazine storage is really not necessary and I prefer to have a rail to put the handle / lamp / mini grenade launcher.
I think you should plan in a 2nd time (or at the same time) to make a version without this compartment with just a rail.
We'll keep in touch.