Jim French is a phenomenal welder, he knows his stuff.
Anyone making billet cases for a fortune to do a replica like repro of the original Magnesium cases.
If you ever catch the magnesium case on fire it will be pretty spectacular as it melts itself into slag, very hot too...
Hard to put out without special stuff like Halon or equivalent if you can't flood it with inert gas to smother it.
White Phosphorus grenade kind of fire...
David