The start of my roll cage/tube frame. The tube is 1.5 .095 wall DOM. I used a Hossfeld bender at my work to bend it, that was a pain in the ass, probably because I've never worked with tube.
  working with tube is slooooow
  The coilovers are going to mount to the horizontal tube. I still got a lot of tube to fit.

That is a Z31 (early 300zx) R200 diff with 260z stub shafts in it.
  Had to make way for the cage. The square tube is so the body does not collapse.
  Almost done with rear suspension, I still have to run tube to the back for bumper, fender brackets and to the diff. The fuel cell is going to mount under the X of tubing and over the diff.
I almost welded my self into the cage
Here is the start of the body mounts, I making it just to hold up the rear part of the body. Its not meant to be another structural part of the chassis.
  Up untill now I had only tack welded the tubes. There is no way to fully weld them in place. After I had fitted all the tubes for the back I had to remove almost all of the tubes because they overlap.
  This is one reason why I cut the back of car out.

  The only thing holding up the back of the car is those 2 pieces of box tubing  welded to the bottom of the wheel well. I was worried that the car would collapse .

 
  Moving the cage back made it easy to finish welding
  Had to have a picture of me tig welding
   
  One thing I learned; Its easier to block up the car to ride height, then build the suspension to hold the car at the level. Its VERY hard to build a car up in the air and get proper suspension travel at your predetermined ride height 
  Opps, my cutting torch slipped. The picture is smoky because I caught a rubber bushing on fire

From the very beginning of this project on thing has bugged me. How to rigidly mount the steering rack so it  has good suspension geometry and will clear the front sump of the SR20.  After making or modifying 4 cross members, I decided the only way to do it was to replace the front end

   1st I drew up plans in a CAD program to check clearance and geometry. Drawing it up made it a lot easier and faster to build because I cut up all the material at on time on a horizontal band saw to the predetermined length and angle
  I made simple fixture so I could make both sides of the frame rails the same. It's just a square that the frame rail was clamped too.

the nice thing about having plans to go off of, is every thing is a perfect fit as you can see in the fitment of the frame rails
  all most done