These collection is intended for configurations of (scifi-) sceneries, walls, spaceships or other technical facilities. Several parts are cascadable for the seamless concatenation. Look at the following list of the parts that make up such a group.
group 1 - part 11 - 15 group 2 - part 16 - 20 group 3 - part 26 - 30 group 4 - part 31 - 33
All parts are low poly (0.3 - 5k polys), except object 12 (15k polys)