The chimney is built but not enclosed, the new stove (HearthStone Heritage) is sitting on the floor. Originally, I'd planned to use wood studs, sheetrock, shields, wall thimbles, metalbestos passthroughs, and so on to re-enclose the chimney. Someone suggested using steel studs and Durock or Wonderboard, neither of which have I any experience with--and saving myself worries about flammable materials. Is it as simple as setting up the steel studs and attaching the Durock and then passing my single-wall stovepipe through the Durock and into the thimble? Is attaching the Durock tricky?