I've had quite a few requests from 'bolters wanting to know more about what was involved in casting the Stovebolt Topper and foundry work in general...
I'm NO expert, just a hobbyist trying to put out a quality product... But this pictorial should give curious bolters a good idea of what is involved in casting...
... The Stovebolt Topper!
http://www.whizzerick.com/bolt_topper/casting1.html