Sounds good. My foundry is well on the way, I have already done a couple aluminum melts with it, very fun stuff
I have some petrobond waiting for me. I am going to do a practice cast tommorrow and then rig up a "test block" to see how well a block will come out.
If that all goes well I will look into having one of my nice spiral designs CNCed with a tapered endmill to produce a prototype and start copying the prototype, with sand casting, in diff metals.
I wasnt planning on copper but now I am reconsidering.....