[Arran]

Mike:
Assuming you can't find another RF shield assembly from a parts chassis (the same chassis was also used in consoles) I don't think it would be impossible to make as you at least have one or more originals to use as a pattern. I would try making patterns from cardboard, or stiff plastic first, but I think that what you mainly need is someone with a brake to bend up the partitions, though using a vice and angle iron will work. Is the RF shield steel or aluminum? In the pictures the bottom portion looks like aluminum. I think that the chassis rails may be as the R7 Nipperette/G.E S-22 chassis, though the length may be different, I picked up some steel channel somewhere to make some for my J-82, but never got any further then that, I have the ones from my G.E S-42A to use as a pattern, if I can find the channel again.
I don't have one of these sets but I have one of it's younger siblings, the M-81, it also has eight tubes, but doesn't have the extra RF amplifier stage, however I don't think it's much easier to work on, lots of rock hard rubber/gutta percha covered wire, and it has a dead audio interstage transformer too, but it's a more normal one. They are nice sets, but the parts quality suffered with age, almost all of the resistors like to drift.
Regards
Arran