4 inch flange from the edge of the product to the outside edge of the mould, basically enough space to layup the stack and stick down the edge of the carbon and lay the infusion lines, gum tape with out struggling for space.
Wow that is some Technicolor plasticine you got there, make sure the plasticine is nice and flat and the edges are nice and smooth it's worth taking the time to get a decent finish on the mould.