Personally, I feel like the AT doesn't actually look much like a transport. More like a gunship , a mixture of the Monate and the Interrogator ( LH Gunship ). Might be because I can't really imagine to compare it to anything. In terms of shape and all, it looks pretty BW to me, although unless making it something like the Salvager or the Raba maybe, I don't really see much future for it, as its shape with 6 transport guns ( according how you showed to place them ) might turn out to not be capable of much. But I'm eager to see how it goes.
On the BT , I wonder about it's purpose, cause if it's ment to be another "goods" transport, than what's the point of it ? If the plan is to make the OC and Sair shipline equal in temrs of ship numbers, than a train like the Essedarius would fit in the line more imo, but again, we'll see how and where it goes.