That is so wrong. You're supposed to use Hirst molds to make dungeons to fight in! Not candy!

Wait...deformable terrain...no storage issues...

Hm... you might be on to something there.

As for drying time, one thing you do with the plaster is after the bits are out of the mold you use a food deyhdrator to dry things out faster. It might work while still in the mold.

Could always get copies of the same mold