I reviewed the door mechanism assembly instructions and started by dry fitting all the parts. Good thing I did. C-1007 handle slide assembly did not want to slide inside of WD-1022 door handle assembly. I spun some emery cloth onside the handle assembly removing the over sprayed powder coat and a little weld berry. Both handles needed to be cleaned up. Also, C-1008 handle lever had about 1/8" arch from the stamping manufacture process and needed to be straightened. Once done the p went together fairly well. The lock assembly has 2 nylon, 1 steel and 1 aluminum plate. After drilling and shaping the parts, I alumipreped and alodined the aluminum plate and added nut plates. I ended the day by drilling a 1/2" handle hole and two #12 fastening holes in my right door.