Kit bashing.
Scratch building.
RMwebing.
LNER OO gauge.
Some LMS and GWR.
Building exhibition layouts.
Long walks in the snow at night.
Throwing rocks at campers and avoiding humans with cameras.
You could quite comfortably get three trucks in here so why not 3 layouts? Got the HiFi system pumpin out all my favorite rock-n-roll, aircon, bottle of cabinet on the go etc. There's just got to be a better name for it than the Man Cave.