I replaced the whole cab floor on my 46 including the foot panels behind the pedals. I made my own because I needed to have clearance with a slight transmission tunnel and made a steering column coupler for the floor since I wanted to keep my stock steering column. It isn't very hard to do. I did not worry about making it super pretty because I will be putting sound deadener on it and carpet over it.
You can make it pretty much how you want with some sheet metal, a welder and a bead roller.
