My estimate for space needed to display it properly is like an over-sized two car garage with a loft. Bottom deck would be 26' x 32' and 9' ceiling. Why the loft? Well, I keep the original boxes/styrofoam and need the loft for those items. The loft would be unfinished, it's just for storage anyway.
Modifying those existing plans was a pain, but you get the idea. This would be attached to the house.