Has anyone ever replaced the entire floor of the cab? I noticed that GMC pauls is selling a new item. Complete lowhump cab floors. I would think that people would be really interested in them. I know that it would probably be less work than replacing patch panel here panel there etc. Here is the link to the floor and another link under that for 5 inch off set firewalls.
http://www.gmcpauls.com/pictures/67-72cabfloorpan.jpg
http://www.directsheetmetal.net/pages/chevy.html