One of the things that truly bug me about this kind of thing is that it has all ended up pricing oridnary workman like sensible gear out of all proportion.
These things were staples back in the day now they've become collector items like tiger-skin rugs and stuff like that the cost far exceeds any practical purpose that anyone sensible will pay.
I recently looked into getting a replacement AKG D12 and the best price I could find for a tatty looking example was around £400. This for a mic that was pretty much on a par with an SM 58 in it's time. SM 58's have been priced at just below the £100 mark new for as long as I can remember and the newer AKG the D112 weighs in at a street price new of around £130-£140 so the price parity there is still about the same as it always was.
I know why I'd prefer the old D12 over the 112, it's merely to do with the shock mount and the resonant chamber that was built-in underneath the capsule which gave it a distinct sound, but I ain't mug enough to pay £240 over the odds to get an antique just for the bragging rights and that minor tangible difference in tone.
Funnily enough I always used to run with a D12 in the kick and a U47 outside and I could probably count on the fingers of one hand the times the U47 track ever got used, if I'd spent a few grand on one today I'd feel compelled to use that track whether it was needed or not just to justify the cost of having that mic even though the cheap dynamic has given me exactly what I really need from that position.
I've heard some of McQ's drum recordings and I'd humbly suggest he could gain much more from attending to his current kit micing technique before worrying too much about the internal resonances inside a mic body that is the same shape and dimensions as every other U47 clone out there.
He laugh at all the Sonar console and other hardware emulation DSP type stuff yet he's here justifying a very similar kind of minutiae dressed up in a shiny $300 custom body. And I'm just saying what he says to everyone else that claims anything about anything in these types of situations, show me the evidence. Of course he wont because he can't. He knows that and I know that.
He's having fun though, making stuff up from the components, I get it, good luck to him.