I looked at my cooker and the patent is listed. Here is the link:
http://www.freepatentsonline.com/2696161.html
I'll go to the aluminum foundry this week and get a quote for getting them cast using an original as a pattern. There is a rivet tool on EBay that is suitable for setting the rivets to hold the two halves together. There is a huge rivet supply house close by so getting the rivets shouldn't be an issue. To complete the cooker all that has to be done is to drill 4 holes for the rivets, rivet the two halves together, and drill and tap two holes for the handles. If the castings are reasonably priced I'll buy the rivet tool, rivets, do the drilling and tapping and make them available. End users can then obtain bolts and a bit of wood for the handles and complete them.
Stay tuned.
Gus