If you really want to try to do this, Catttrina - and I have read the books - Steve Jackson Games did a Callahan's Crosstime Saloon book for their popular GURPS RPG that included a floor plan. Don't know if it is still in print, but it may be available used.
I have done business with
NOBLE KNIGHT GAMES - Role Playing Games, RPG's, Board Games, Miniatures, Dungeons and Dragons - New & Out-of-Print and they are quite satisfactory.