The Kerbal V rocket is one of the largest rockets in the catalog. However, once project Kerballo was cancelled, KSP had a new idea to use one of the unused Kerbal V Launch Vehicles for. They would replace the third stage with a huge space-station, and lift it into orbit using the Kerballo 19 Launcher.
Several Kerbal IB Launches would permit crewed habitation of the station.
Forum Thread: http://forum.kerbalspaceprogram.com/showthread.php/46627-Kerbal-V-SPACELAB-EDITION!?p=601163#post601163
Imgur Album: http://imgur.com/a/xh581