I used the entire chassis,Transmission,sleeper,etc...Basically I used the whole truck less the hood,I cut the fronts of the fenders off to get the headlight buckets,cut the cab all apart to use the doors and jambs and the center section of the roof. and I cut the doorpanels out of the interior,the seats and bases steering wheel and column and so on...There is very little waste of the kit,actually...The dash shape is correct to a 1980...And depending on how a particular truck was optioned, 3 dash designs were available...The cab hinges will be 16 gauge sheet metal...I haven't had much luck with brass...Painting sheet metal requires less prep than brass too,And not to mention...Cheaper!!! Oh....And workin' with "Metalglow"....LOL !!! It's a Blast!!!