That is helpful, thank you!
And yes, I am overly concerned about aesthetics.

I've researched the Super Mighty crankset and I'm 99% sure it is ISO taper, not JIS like I had with the Super Maxy cranks. Since you mentioned that most BB's today are symmetrical, it sounds like looking for an asymmetrical BB would be a waste of time(?). So, correct me if I'm wrong, but in that case I would just look for a spindle that is 3mm longer than the 124.5mm that I have now(?). However, it looks like nearly every spindle I can find is a good 10-15mm shorter than what I have... and my head is about to explode from all of these different specs. Fun!