Just about every "boutique amp" out there is a bog standard Marshall circuit with a few component changes or an extra stage here and there - trust me on this, I've got schematics for a lot of them.
Dave's mods are no different, the only real difference between the Marshall circuits and Dave's mods is that he ties together the first 2 stages so they're wired in parallel, he even says himself that the tone he tries to acheive with his amps is the ideal Marshall sound he's got in his head but that cleans up well. I think he does a great job with the reissue amps, and although they don't sound exactly like a cranked Marshall, they have a cool vibe of their own with plenty of harmonics and feedback which is really nice.
When you have to pay thousands of pounds for a Bolognese amp to get great tone, I'd start looking at your playing instead.
