Cool post! After learning about B fields in college physics, I've always been wary of placing transformers close to any circuitry without good shielding (despite trafo mfg claims of low b field). I use stainless cake pans. As some have mentioned above @erik_squires it is nice to have the dc close. One idea I read about recently which seems to be the best of both worlds is to put the trafo and the first bank of caps after the rectifier then use the umbilical cable for a pi resistor (around 0R1) then place the second cap bank in the circuit chassis. Pretty cool. I'm sure SMc has implementing something similar, since he likes his clean ops DC juice close. Really close. As do I... peace
