With the new air forces coming may I recommend engineer 3 who can build the flak 88
Flak 88 and other big calibre AA guns are useless because thdy are meant to shoot aircrafts from 8000m above and always used with a fire net.
I dont think so they can tweak it down for a video game plus itll be against larger bombers
If so, it should be nothing bigger than the 37mm, it would be enough to deal with bombers. 8.8cm AA gun would be bad in two ways. One, it used timed fuzes, that were set to an altitude before they were loaded into the gun, and two, it weighs about 7.5 tonnes, so it would be a bit of a stretch for engineers to build them.
I’d rather have a possibility to repair those high caliber “anti-everything” cannons that would be already placed on the map in some decent spots (mainly against ground targets), like they are on Berlin maps - this would be more realistic.