The Katydid carries 20 cargo pods, 5 on each pylon, and the pylons are set for a USD style doored container with an offset docking rail. There is a 21m gap between stops on the rail, and containers need to have no larger than a 11x11 face. This comes loaded with containers and carrying a cargo tugship docked to the back. It's underpowered(corporate speak for efficient) and requires the auxiliary power to operate at more than bursts of thrust. Has four turret dockers between the racks for defense armament if required.
Activating pickup points, forcefield docking guides, and jettisoning containers is controlled through inner ship remotes. Jettisoning containers may be done through wireless on the accompanying cargo tug(docked on rear). In the absence of the tug, the dock may be locked out from the inside to prevent people from docking or opening the airlock(through permission block and signal sent to the docking rail). The outer airlock door must be closed to prevent outside access to the logic controls.
I plan on making a modular version capable of changing out the cargo rails for varied configurations and pod types. PM me a link to your cargo container or send me a .sment and I'll make a rail pylon for it.