OK, thats the coolest gen set I have seen! Kolher has been around for many years and are one of the best I have ever worked on, but that old girl looks to have a cast iron oil pan and will be a heavy thing to move, good thing for the elevator! I have serviced new versions of this unit in some of the old fish camps here on the coast. They have custom made oil pans with deep sumps that hold 60 to 100 liters of oil so they can run for long times between services, and they run 12+ hours a day - everyday. If that were mine I would put a glass top over it and use it for a rec room table, just so cool to look at.
If you do go to fire it up, change out the fuel lines first as the new gas will cause them to shed little black specs of crap that clogg up your carb in no time.