The small transport would make a good freighter, imo. Freighters have that "hybrid between GB and snub" look, which your model strikes well.
The large battle transport could become "fatter" (in terms of front profile) by adding more reinforcement beams for the "shell" that is there to protect the inner cargo container. I mean, it is an Outcast transport that is meant to take the heat, and half of Sirius hate OC ships. Therefore, a "more armor!!! Weld it on it! Top and bottom!" would imo fit.