No, there's no depth. The only NFB options are the switching between the two presence types for the various eras of Marshalls. There is a switchable fat cap in the preamp though
I've got 2 1959HWs that I've modded, no problems at all. It's probably also worth noting that Jason has no problem modding a pretty much non-stop stream of amps with the new transformers for people without changing the iron.
I've always done my own, you're basically looking at a drill press and one custom / specialty bit to do the staking for each turret size you plan to use.
I typically do my layouts on graph paper... should probably go more high-tech on that lol
I talked to Mark about this when I was building my Aldrich, he said that it should probably be called the Norum mod since Norum used it first and that is what is on this album.