the 'misinformation' net is a funny beast.
Maybe someone has a gripe with voodoo, maybe it was earlier work (pics posted that is).
I would imagine they do some good work from reports I have heard and lets be honest, if making most of their living with mods, they probably don't want everyone to see as much will be through knowledge/experience and not material cost.
As for amp modding, I would hasten a guess that any GOOD (key word there) amp tech./builder/boffin could disect a circuit and assess if anything could be done to 'tweak' it for the owner. Amp builders design for the massess and usually not for individuals (mainstream of course).
Personally I was just being curious to thoughts. I have a local amp designer/mad scientist type who could probably tweak my amp if I wished (just don't wish this with a brand new Bogner right now lol) and indeed I have a feeling Bogner themselves can do this for a price (as have heard there was design options left for this).