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With foil over foam, you will not get a sandwich construction. The foam and everything under the glass/matrix will have to be discarded.
If you use a proper foam, like Divinycell, Airex, Balsa etc., the foam will be permanently bonded to the glas and constribute to the strength. In this case, you can use just a thin layer of glass (400 - 900 g) on either side of the foam to get a really strong and lightweight laminate.
If you want to make a cheap plug or mould, a trick is to cover the not-styrene-tolerant foam with plaster. This is cheap and harmless and can be shaped easily enough. Before putting resin and glass on it, make sure you wax properly or use mould release fluids.
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