A friend of mine had converted his Ramcharger truck, which is kinda similar... He's a pretty prolific tech poster when it comes to tech and how-to articles.

Mad-Max on RCC about Hydro-boost

Myself I need to do some junkyard scavenging. I've seen modern Mustang hydro-boost brakes converted into older mustangs, and I've read about people using Chevy minivan parts.

I'll definitely be interested to see what others have to post on the subject.