You have probably thought of all of this, but I thought I would throw some ideas out there anyway
I would imagine that as a part of this facility you were planning to have a fairly complete workshop including a lift, dyno and all of the other necessary tools to maintain and even improve such a mighty fleet. Taking it a step further, you could think about having some fabrication tools on site as well as welding and machining tools. Imagine having your mechanic come to you and do everything on site.

I could even envision a built in fueling station with several octane levels to suit the requirements of your fleet. You might want to think about an office/sitting room for memorabilia, watching videos and keeping records on all of your fleet.
I am really looking forward to seeing this project as it takes shape and comes to life.