I have this old forge that is not complete. I have done some research but have come up blank on the missing parts. All I really have is the pan and pedestal. I have built a Bob Patrick firepot  but wanted to inquire one last time if anyone can explain what is missing in enough detail to replicate them. I am also torn between trying to recreate the down draft system with a good blower or use a more conventional chimney and side draft hood

Try this thread:  

 

Not sure if it will help but here's a pic of it in an old catalog i found in the interwebs....  I was researching a downdraft/powered vent system myself.

 

Well, it's done now. The fabricated fire pot works really well. Oddly, this is the first time in 20 yrs or so that I have used a modern commercial style firepot. 

Very nice!