Got the stretch done today (not welded, just stretched)
I have 2 quick pics attached. The first is just a pic of the stretch of 10.5", and the second is the idea that I stole from apsara in solrac's reventon build diary. I didn't want to use round tube as I'd find it really hard to weld to the frame, so I used square tubing - 1and1/4 pieces that are 6" long before and after the cut, then slid in a 2ft long piece of 1" and tacked it to one of the tubes. Just like the diagram in the other thread it worked perfect. As soon as I was all the way through the car it sagged a bit since the tubes weren't perfect (they had a bit of play) but they held up fine. I walked side to side sliding the car along the rail 1" at a time until I hit my 10.5" stretch. Took maybe 2hrs altogether from starting cutting to getting it stretched and the rails just tacked up for now so the rockers will stay at 10.5 while I take measurements and tweak.
Quick note: I cut behind where the rails were before I welded them on, otherwise it would suck to get the body cut and not hit the rails.
So now the car is sitting on one low rise jack on each side, and I have a 2x1 beam held up with a jackall under the center console. Just trying to take some pressure off my rails, and the tube under the console eliminated the rest of the sag in the frame that I DO NOT want to weld in. I've done about 6 diagonal measurements and seem to be within 1mm, but I'm going to do more then start the welding. I'm thinking of putting a piece of 4x1 in the rocker panel to start, then sleeving the rest of the rocker, sleeve the center console, angle iron at the top and bottom of it, then the quickie floor pans. We'll see how it goes, but I think this is my plan.
I'm very interested to see if anyone has some advice or OMG STOP for this part, as it's the most critical that I can think of. No comments on my welding though
, I know it's not pretty but it worked, and I think I'll get a welder friend of mine to do the seam welding for me. I'll just tack everything up for him. Not sure though. I'm quite indecisive until I decide
edit: why do my pics always go sideways? they are taken vertically and on my comp view vertically.