[Zeke]

Pics one 1 and 2 would work since the steel frame is 2 x 2 square tubing. 3 and 4 are mortise and I can't use a mortise lock. The skin is T&G redwood on the outside face. I bolted nailers around the inner perimeter to nail the RDW to.

By the looks of No. 1 and 2 that might be more than I want to spend. But yes, I can weld on a prefab box. Seen a ton of them for swinging gates and they use a 20 buck double dead bolt. I have that on the other driveway gate that swings.

Ah, I see #2 is for a swing door.