DW simplified sand castle

This thing is my entry for the Math Challenge: Build A Castle.
This things are mold set for construction a DW Castle or other model you do use your imagination. The molds are basic geometrics like cylinder, pyramid, hexagonal prism, and cone. The set was designed for use by children and these pieces can used in hard conditions.
Design qualities:
-Thickness 3 mm in the molds that will make them more resistant.
-All of pieces have draft angle to easy removal.
-All molds have top normal surface to the piece to can hit for removal sand.

*Please excuse my limited English.