Yeah if you have the time and inclination you could go down the polystyrene route - shape it, secure it in place, cover it in around 3 coats of tile grout mixed with cement, or tile grout mixed with pva glue, bang on half a dozen coats of masonary paint, throw sand at it whilst it's drying, then cover it in a few coats of yacht varnish (there's probably a better substitute). Bear in mind the whole process can take several days if not weeks - if you use yacht varnish it takes around a week to get rid of the toxic fumes.
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1.0.1 Bearded Dragons
1.0.0 Mississippi Map turtle
0.0.1 Razorback Musk turtle
1.0.1 Freckled Monitor
2.4.0 Bearded Pygmy Chameleons ( Rieppeleon brevicaudatus)
1.1.0 Pitted Pygmy Chameleons ( Rhampholeon temporalis)
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