No idea what to make but we have used lots of that type of foam before..be prepared for a messy clean up. Power tools will cut it fine and I use a sand/paint mixture to sort of make a hard shell. You can also make a stencil with contact paper and use the spray paint method to eat away an epitaph without worrying about it eating away too much. I would test a small piece first tho' just incase yours is a different type of foam. I've had some pices that would crumble in your hands if you picked it up.