Just drill a small hole and press the pieces together and put the rivet in. I did them pretty close together all the way across the gap. You might put a jack and a 4x4 under the middle of the cab to raise it up a little to relieve the stress on the body panels. Then I think I used some vice grips to pull them together before the drilling and rivet install. Once finished with that I used some black Permatex type sealer inside and out to make sure the thing was sealed good. It's worked great so far. I'm need to run some tubing through the bottom of the cab soon (roll cage prep) to hold the bodys weight even better and to mount the seats and belts onto. That is the best way to hold the body better to keep the thing together. B)