replacing floor boards

hey guys.  I am looking for help form anyone who has replaced their floor boards.   The section we are going to have to do is the very front area up in to the toe board area.  from what I can tell part of it is like a double thick.   its the area wear the body mounts are up in the front.    has anyone had to replace this area and have pics of what it all looked like?   did you have to have to take the body off the frame?   Being that part of the area that we have to work on is directly over the frame I would assume this would be a lot easier if the body is off the frame.      Any input on this is going to be a lot of help thanks guy.

btw anyone with Paint& Body questions as well as restoration and fabrication work feel free to PM me with your questions as I am a professional with 26 years experience and been restoring cars since I started doing bodywork.I work at a collision shop now fixing wrecks but had my own restoration shop for 4 years and still do restoration work on the side..Don't know if there are any other professional body guys here but I could be the resident expert, so feel free to contact me direct.go to the url listed in my sig to see cars I have restored and painted.I use to have a dot com when I had my shop but shut it down after I closed my shop,cause of inquires for resto work.It was kewl cause I had in before,in progress and finished photos of the builds.oh well someday I might build another site,doing it myself this time though.

if the brace is rusty and eaten away by rust in areas you might have to cut out the bad area and get some thicker gauge metal like the brace a section in some new metal.I restored a 66 Dodge Charger and a poece of the frame rail was rusted thru,the are unibody so there wasn't much there except the top.lucky we were able to take a good section from a parts car amd section in the piece.it was no more then a thick piece of sheetmetal.I have made new pieces and spliced it in so many times cause the part was not available and couldn't wait to search all of USA for a piece out of a junkyard so I match up the gauge of metal & bend &form a new piece & weld it in..first you have to cut out the bad floor pan & clean everything up and see what you got,then go from there.Now you will know why it costs so much to restore a car at a body shop.1st you are paying for their expertise & second you are paying for their time involved & when you have to fabricate pieces cause they don't make it aftermarket it can take alota time.

Continuing my previous post...
In my case the body and frame were both too rusty to be  properly repaired with the body attached to the frame, or so I think as I´m not a professional in bodywork. Frame was so rusted under the bushings the bushings were almost gone throught the frame,  the bushings were collapsed and had to be replaced, and you can see from the picture above the body needed some work too.
Without no doubt it was easier to fix these issues with the frame off.

Yes, that area is sort of a layed area. It's a structural portion of the body tub, so you will really be best to take the body off the frame and replace.