I also have a section of the cab floor coming from jc in New Jersey. I'm going to trim it down to the same dimensions as the high hump cover so it will bolt in, but have the low floor configuration I want.
Edit: received the part today and got it cut to fit.
What do ya think? I'll cut the firewall piece from my cab later.
Got the rust cab corner cut, was able to see the inside part that will need a patch also. Overall I thinks it's pretty dam good. I have to do a little more grinding and cleaning before I seal up the hidden spaces, then it'll be time to do some welding. Hopefully we can get that going in a couple weeks.
