Thanks for that hint, I can see (connected living space) clearly now! Working: - Color coding of connected ship elements - Hatches open and close and separate connected living spaces - Transfer between clearly unconnected pods is no longer possible Now my only problem left: Two 3-seat-pods, attached through their smaller ends with clamp-o-trons, give me the controls to transfer Kerbals, but clicking the transfer button does nothing except for seemingly random log messages. Seriously, I'm a software developer, but these logs are just... random. Like a docking port not being attached ("removing it"), and never the same logs for the same button. I guess something is still messed up here, probably just in my installation. I'll try fiddling with what plugin folder goes where...