To add on Redmoon's post, you can use a varied types of "styrofoam". In fact the correct term is polystyrene, and comes in either expanded and extruded, in sheet form and than great stuff is a can dispensable version. In fact Great stuff is a expanding polyurathene foam.



I like extruded polysterene because its less messy and can fill a big space quickly. It comes in Blue, Pink, and sometimes Yellow, Home Depot and Menards sell Pink, Lowes is Blue.



Expanded polystyrene is the styrofoam you are most familiar with. They make cups plates and the packing material for electronics and kids toys out of it. It comes in white and in sheet form, very messy but easy to carve and create shapes.



Both products can be used together and can be attached together using contact cement or liqid nails actually makes a glue designed for sheet foam. Once the basica structre comes together you can use the great stuff can to fill gaps, cracks creat finer details, etc. Once cured you can finish the carving and coat your work.



When it comes to the finish works there are tones of ways about it so I won't be specific.



Good Luck
-----
Jeremy



"I am become death, the destroyer of worlds" July 16, 1945 Robert Oppenheimer



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