I don't bother worrying about the thickness of a wall. Stuff changes too often for me to go back and revise my drawings based upon every little finish change, like gyp board thickness.
Why would you ever draw that minutia level of detail on a floor plan? That wouldn't -ever- show up on paper.
I draw my walls 4" thick or 6" thick, even, depending on stud width. 3 1/2" stud (or 5 1/2") + 1/4" gyp on both sides... it's a rough thickness, but it's good enough. No way I'm ever going to worry about drawing every little thing exactly perfect in Autocad.
As for construction actually matching it... hell no. They'll do their best, but the nature of wood construction and the methods involved, added to the fact that they can't spend all day worrying about fixing that last little trailing 1/16" off the end of their wall... no.
Where's this question coming from? What are you trying to get at?