DJ, that's entirely possible ... somewhat wasteful , since you can add and subtract thin/thick sheets with no consequence ...using Much less Foam , generating much less waste ...

But if you already have a big block sitting around doing nothing, well ...
Having used and still owning several hot wire foam cutting devices , I can attest to their usefulness and versatility ... Most any shape is possible using cutting templates or free hand carving/shaping ... However , you Must take Care not to electrocute yourself, burn your skin , or breathe in the toxic vapors produced with heat .... Hey, it's Plastic !!! Done safely in a well ventilated area, it can be great fun and Quick , producing no foam dust ... allowing rapid parts fabrication ...
