https://makezine.com/article/craft/hirst-arts-cast-your-own/
Hirst Arts - Cast your own blocks - Build your own castles - Make:
Aug 19, 2007 - Steve writes -Since you pointed folks at Games Workshop's hobby articles, I thought you'd appreciate the work of Bruce Hirst. He sells molds for folks to
hirst artsyour owncastblocksbuild