[Arran]

Mike;
  In truth I can't remember whether it was 200 or 250, but you don't want it too high or the cardboard will burn. I personally like the idea of putting the top back on the metal can even if the cardboard sleeve goes over top, it adds some extra structural integrity to the cardboard, and it's easy enough to join the two sections back together with aluminum duct tape if the cut is clean.
   With regard to that phono jack I don't know what they were up to there, the usual method is to feed the signal into the grid of the 1st audio tube, or the top of the volume control. I don't know what they were up to in connecting the center of that jack to the plate of one of the power output tubes, and I've never seen a choke involved with a phono jack instal before, maybe they had some other intended purpose, five will get you ten it was a Ham operator that did it.
   On those molded paper caps I think that Dennis Carter did drill the actual capacitors out of the plastic shells with a twist bit in a battery powered drill, they looked like those Sangamo "Little Chief" caps to me with the bright coloured shells. I don't know if the Bumble Bees are molded any differently, but one thing I do know is that they were no better then the run of the mill Aerovox waxies, unlike the Solar "Sealdtite" brand ones which are one of the few that are usually still functional.
Regards
Arran