Hello foxhound, I thought the AC-47 or lack of it may have been the problem, the log does not really point me in any direction. There are a number of issues in there, the shells problem could be the miniguns but the mod has all the bits as far as I know especially as you have the AC-47.
I would think the install you are using would more than likely contain all that was necessary, does it have the Skyraiders, it is possible someting in that mod is needed as that carries various gun pods?
The B-29 fm is mentioned but that should be default anyway, the mod uses that from the sim not one of its own.
I had a tool installed 'HierMesh Debugger' which caused my 4.12.2 with ModAct 5.30 to freeze once you were in the cockpit, probably because there is so much stuff in my install it would freak out any problem solving tool.
Do you have that?
Some of the aircraft also locked the sim at 100% in the QMB mission start, sometimes that could be cured by moving them up the hierarchy, that may be worth a try.
Sorry I cannot offer you any definitive reply, there can be so much variety in any install that it is difficult to pin down to any one cause.
Wishing you all the very best, Pete.