Once you like the fit, weld everything in place. Next you will need to install a stopper on the inner door to stop in the opening position.
Then tighten the jam nuts. Next install the striker plates inside the sub frame. The top and bottom may be different gaps. My top was a 1/2" and the bottom was 1/4"
And done! Fire is lit and got some burgers on. Funny story, I left the shop with mack in tow, went to Lowe's to get a ball valve for the drain, parked, got out of truck and a guy asked if he could buy it lol!
Here's a look at the difference an insulated bottom plate in the WC does.