Have a design for a full grunt armour, except no helmet just yet, but unsure on size to do, since I was thinking about getting them CNC cut was wondering is there much call for sizes in a small medium or an XL size?

do you mean your about to put up machined armour for sale? depending on cost there will be demand for all sizes.

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Reformed Pacifist

Looking to do a master in each size if theres enough interest, isn't cheap so castings will likely be in resin and fibreglass to keep the price down for people but a nicely detailed armour In different sizes gives everybody a chance to troop I figured

I would guess M, L , XL would fit most.

Then maybe XXL.

Problem would be the leg guard lengths also.

True, with the knee usually attached by a strap to the shin, as long as the gap isn't comically big i would imagine that may cover a little in size discrepancies