While messing around thinking of payloads suitable for a Nexus, I started working on a giant 70 foot (half scale) re-entry pod.  That thing rapidly became a monster.  A single part that's a small town with tanks and labs, and observation decks and it needed cargo space, etc etc.  So, eventually my brain suggested the following ideas to me, way later than required to maintain sanity. If instead of making one giant preconfigured pod, I made a series of pod floors, that are interchangeable, th