Hello -
My apology for any apparent lack of follow up on this project. A few interruptions and various priorities took precedence. Anyway, I think the answer to the original heat shield attachment question was recently solved. A good friend with years of experience in the engineering and mechanics profession revealed that silver soldering the rivets was probably the answer. That sounds like the most logical and simple solution.
So, the next step is to clean up the matching holes, trim the length of the rivets and solder the buggers in. The entire shield and bayonet attachment will be blued - not sure if I'll cold blue myself or have it professionally rust-blued. Meantime the bottom of the barrel needs the grooves added also.
Results of each process should be within the next couple weeks.
Hope all is well with you guys,
Dick