*Prepping for Removal of Inner Rocker Panels*
To remove the inner rocker panels first you must thoroughly brace the car because these are the main support of the car, this means taking the car off any of it suspension and supporting it levelly with four jack stands, best places for these are just fore of the leaf spring shackles, and just fore of the front torque boxes, this puts equal pressure and "balances weight" off of the rocker panel. Next, you will want to install a door brace, these can be made or easy had from cj pony parts for just over $200, normally this is over kill if properly supported, BUT, since your are doing a full floor and tunnel you have to do both sides at once, and its is a MUST...
Shown Here is a Brace you would need if you weren't replacing the tunnel, available at cjponyparts.com
But since you are replacing the tunnel, you will need to find or make a set like these
These would be best for you
^ These are available at http://www.accessiblesystems.com/udb.php
If you feel like I am dwelling on these braces, you are mistaken because they will maintain integrity of your car, I failed to use these the first time around, and my doors no longer fit... and had to re-do a lot of work.
*Removing Inner Rocker Panels*
First you will have to acquire many 3/8" drill bits, a reliable drill, an air chisel with various metal cutting bits.. you'll need it,
there are well over 300 spot welds that have to be drilled out to remove what were once inner rocker panels, fairly self explanatory but a few pointers are to start with the seat riser, this is a large majority of spot welds, get that up, then move along to cutting the bulk of the floor up and gradually drilling the spot welds that keep it down to the various frame bits. Now that the seat riser and the floor is out, start drilling along the row of spot welds top and bottom holding the inner rocker in, also under your fenders, on the torque box, there is a tab of inner rocker bent over and welded. Now is also a GREAT time to replace toque boxes if they look the least bit shoddy. Also removing the torque boxes makes the job quite a bit easier. so once you have the inner rockers and optionally the torque boxes out, move on to the next step.
*Install Floor Pan*
Yup, this comes before the rocker panel, because of the pans directly under where the seat riser were, the lip on the floor pan tucks over that, then the rocker goes between that lip and the outer rocker panel. then can be welded together, my floors did not include the tunnel so I am not much help here. But there is plenty of info available for replacing floors, onwards...
*Installing New Rocker Panels*
Before even putting them in place drill holes about every one inch, you can use the 3/8" from earlier, or slighter small if you wish, if you chose to go smaller, place them 7/8" from each other, now if you have the torque boxes out you cant slide them in from the front and get them to where you need, if not, well I'm actually not sure what to tell you =/, get this all welded up, put your torque boxes back on, finish up any welds for the floors, and be glad you finished before your 90th birthday =P
This is not for the faint of heart, and if you do not have the skill, time, will, motivation, tools, space, and devotion to do this, it may be better off left to the professionals....
Please PM with any questions, i got lazy towards the end of this, but you lucky i made it this far, any one on here knows I am not one for long responses like these =P, oh well another convertible fan is a friend of mine....
heres some more on inner rockers
Oh yeah one more thing, i couldn't have written this without listening to The Who so this is to them.