okay a little more. The inside globe has a 2' diamater and the copper tubing has 2" spacing from the globe, and 3" spacing from itself. The smallest circle has about a 11" diameter, and the 180 deg U's span the ~4" gap (they will be formed by hand on a mandrel not 90 deg L's) I sketched it very fast so the 180 deg U's will be spaced further apart. there will be at least 4 brass unions so that the rigid radiator can disconnect from the inner globe, and so that it can disconnect in half to be seperate (none of that is shown)
the pipe will remain as is, no fins or extra turbulence, I'm figuring its only advantage is it's extrodinary length with hopefully low constrictions.
the res will be mounted at the bottom of the loop and there will be ball joints so that when disconnected the rad nor res would flow out (if desired). it would have 2-4 extra threaded holes to mount a second pump which will pump the loop for the extra comp and a set of spares to possibly include a 2nd computer.
is it making a little more sense now? The radiator loop will operate seperately of the computer loop and have its own pump, I'm guessing a high flow pond pump (22gpm at no head) with no constrictutions (besides unions) could operate around 10+ GPM but i could be way off, I'm on the fabrication side, not the engineering.
I'll polish and post the sketch if anything else needs clarification.
did I miss anything obvious