1970 GMC 3/4 ton rusted floor boards.

I am new to this form just joined.
Does anybody know where to get information on how to replace the floor boards just inside of the rocker panels. The ones on my truck are rusted clean through along with the bracing. I have bought patch panels but cannot tell how they go on. The pictures in the tech section on replacing rocker panels do not show enough. Have heard that someone has done a video or book on how to replace the floor and bracing on these trucks. Any help would be appreciated.I am a novice at doing bodywork.  

What tech article are you referring too?  

The article on how to replace rocker panels in the Technical section on this web site. My rocker on the passenger side is missing and about three inches has been cut away towards the inside of the cab. There is nothing between the front and rear of the door jam. I bought the truck in this condition.  

Do you have the exact url to the article?  

Its on this web site just click on technical and scroll down the arcticles but it only shows how to replace the rockerpanels not the floor or bracing.  

We have over 15 pages of tech articles, do you at least know the title of the article?  

The Article I am referring to is called [67 Chevy C10 Rocker Panel Replacement Rocker Roll] on page 8.This article is great for the rockers but not the innerpanel or partial floor. I have bought the factory manual that brothers offers but the pictures were horrable could not figure out how the patch panels went.  

Darryl48:
The Article I am referring to is called [67 Chevy C10 Rocker Panel Replacement Rocker Roll] on page 8.This article is great for the rockers but not the innerpanel or partial floor. I have bought the factory manual that brothers offers but the pictures were horrable could not figure out how the patch panels went.

Oh that article, that was a good reference article and here is that link for anyone else who wants to check it out.
http://www.classictrucks.com/tech/0601cl_1967_chevy_c10_rocker_panel_replacement/index.html  

The best thing to remember when installing patch panels is to be patient and take it a step at a time. Whether you're a novice or a professional, body panel replacement can be tedious, but also FUN. After all, that's why people enjoy this hobby so much. Any way, I'm also in the middle of replacing my floor boards... and supports... and footwells... and rockers... and cab corners! My cab looks something of the Flinstone variety.  I started by first just cutting away the rusted through areas and about 1" to 2" past to make sure when I weld in the new panel I had solid metal to work with.  The floor supports need some "gentle persuasion." I used an air hammer to cut through the spot welds. You may have to trim your new panels to fit the area you are replacing.  Just because the new is about 2 feet square doesn't mean you have to cut a 2 foot hole.  Trim a little at a time.  Also remember that the replacement piece was made on aftermarket tooling and isn't a 100% factory fit.  Very rarely will a foreign made panel "drop" into place with no trimming or slight bending.  Again, just take your time and have fun with it.  The same goes for welding it in place. Take your time tacking it in place before you fully weld it in.  Body work is a learning process in itself.  As you get into it more, you will see more of how you want the panel to fit and how the end result will be.