A couple "edge" geomorphs from the upcoming book showing my take on bay weapons. Aside from the Azhanti High Lightning deck plans, I don't think I've ever seen them represented in Traveller canon, and those in the Azhanti appear to be in the 30 dton range. I interpret them as standardized weapon frames that can be swapped out for alternate weapons easily. For the double laser, the doors retract and the weapon extends out from the bay and rotates into position. For the missile bay (as shown in the illustration), doors retract to expose the missile launch tubes. If desired, bay weapon doors could be indistinguishable from large cargo doors.
Designer's note: The weapons shown in the deck plans reflect 50 dton weapons bays on a single deck. The illustration shows a double height bay - just an artistic decision - and therefore would be 100 dtons. I doubt the gunnery crew would actually be in the bay as the weapon moves into firing position, I just wanted to show people to get a sense of scale.