For the amusement of all, a segue into a story regarding the MSD body.
These things were first introduced about 25 years ago when it was realised that "one size fits all" (or even a couple of sizes) wouldn't work any more. The material selected for the structure of the 1st Generation of bodies was some sort of esoteric steel called Creusabro 8000. Wonderful stuff it was, apart from one thing - you literally couldn't weld it outside a laboratory........
We tried all sorts, starting with low-hydrogen in various tensile strengths, stainless, etc, etc. Everything that was tried ended in failure to a greater or lesser extent. The only thing that worked half-way decent was Nucleotec 2222 with an elongation spec of over 50%, the downside was it was horribly expensive.
You could do all the pre-heating, needle peening, stress relievieng, post heating etc, that you wanted, but if you happened to walk past a body that had been welded a couple of hours before you could hear a series of "ting, ting, ting" noises as the recently laid down welds cracked. Eventually they were dumped on the scrap heap. IIRC one mine dumped theirs close to the main offices, filled them with dirt and planted flowers in them.........
