camping roll mat, cheap as chips! the stuff in hobbytheft is "funky foam" 3mm thick, way to weak and thin for what you want [/quote)
You're right about hobby craft that's an hour wasted, as for camping roll mats i'd already thought of them and looked at some, they aren't as stiff a foam as i seem to remember, currently looking at exercise mats but most of what i can find is too thick for what i want.