Could do that for the rear brake and part of the way for the gear cable (I think)..
Problem with the Voodoo frame is that there's 2 small tubes that the gear cable passes through at the seat tube and at the brake post.. has to have some sort of tube to protect the cable from friction with the frame there..
Been looking at the HUDZ do-nuts but it all comes back to sorting out where the cable passes through the frame..
Been searching for weeks for some sleeving or something in orange but the outside diameters are too big on the ones I've found and I can't get an electrical retailer to talk to me about internal diameters of equipment wire..