Andy , the floor pan was made from scratch so that i could put it in after the cab was assembled , I don,t have any tips other than I made it just a bit shorter then the kit floor pan ,used a strip of [ L ] styrine along the back so it would not go to far up in to the cab , the floor pan and door panels and dash are all separate , so the dash will go in first then the door panels and then the floor pan , it took some planning but that is how I did it , the floor pan is not as wide as the one for the kit but the door panels will take up the gap .I.m sorry I don,t keep my measurements of what I,m making there are just to meany to keep track of ,