I've never dealt with them but I've heard that the guy covers the mods with some immovable black goo to protect his designs. I've seen pics as well and indeed it looked nasty but I don't have a link to the pics sorry.
EDIT: Found one
http://www.timeelect.com/hackmarshall.htm
EDIT2: and another
http://www.frankencat.com/voodoo/
I'd keep your prized Shiva well away from this guy's hands!!!
Ug, i wouldn't want that shite on my amp... shiva or not.
