Gotta agree wiv phil on this - also take into concideration cut & loss of material as many MCs now require full tight brding with no tube coming through the deck & brds cut to fitbthis all takes xra time so work out ur transport costs to & fro, time for getting materials in & out,any cut & loss incl sundries like caps & tape, then erection & dismanting time & finally put a profit ontop you'll be surprised at the cost but from experiance i dont think youd be anything but a busy fool at ur surgested price