There’s a rib running floor to ceiling in the jacket directly above the throats that would supply stability by providing 2 areas where a thread would be complete to both sides. No room to go in the top is a myth as like I say there’s a rib there which has a min. 1/8” transition radius onto the floor of the jacket. I’ll claim you can raise the roof .15” and still maintain .100” wall. Right now I have no picture upload ability but this looks pretty good. Thanks again for posting as those pictures are keepers.
