I cannot believe there was no posting since 6 months. Since I'm working on a bigger project (the ISS2 is a part of it) for my diploma thesis, I forgot to make any updates.
The renderings show the core module of the space station. Two of six docking ports are already occupied by a small storage module with attached radiators for cooling and a docking adapter for spacecrafts. The docked spaceship is an early but quite accurate model of the actual design of the Clipper (the layout changed a lot since the first version).