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I stretched the boxing plates back to where the frame narrows in front of the last crossmember and then up to just behind the cab. I'm planning on boxing the rest of the frame under the cab to meet up with the front of the frame, but not right now. Make sure to set the truck on good jackstands and level it from side to side, checking the front, middle, and back, and welding in steel stringers to help keep the frame in place. There's going to be a lot of heat going into it once it's all welded up, but just weld a few inches at a time and move around from the top to bottom and side to side letting it cool.