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As already mentioned styrofoam will crush under pressure. Case in point I 
have made great shot "glasses" from styrofoam cups by putting a few in a 
mesh bag and sending them down with oceanographic sampling instruments.
High quality cups make nice dense symmetric shot glasses (about 1/3 size);
poor quality are substantially distorted. Styrofoam plates are hard to eat 
from due to their thinness after pressure treating. Of course this was a few 
years ago before I realized styrofoam was the work of the devil!

Try contacting Kelegecell or Divinicell for rigid closed-cell PVC foam sheets
which will be able to withstand the pressure. 'Or if you would like to mold
the form, Flotation Technologies makes 5gallon kits of syntactic foam (epoxy
type matrix with tiny glass spheres for flotation). I have (2) 6" x 12" x 12"
extremely high quality syntactic foam blocks (apx. 32 lb/cu.ft) ($900 list) 
which I will give away for $100 plus shipping?

Doug Chapman

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