I saw a social media post from Jayson that the preorders for the Throne Room were already 1/3rd of the way to the sold out milestone. I'd love to hear what those numbers are, but I also understand the need to protect sources.
Over on Rebelscum someone has been looking at the Pulse order page's source code and gleaned the available quantity was 19,750 with around 7,500 preordered so far. I think that is where numbers are coming from at this point. 20,000 sounds like a realistic MOQ for the set judging by where successful HasLabs have been landing recently.
When I shored up what my OT collection was going to be back in 2008 I broke them down by scene to make themed shelf displays for them all. I wound up with basic scenes: Cantina. Tatooine Desert, Hoth, Cloud City, Death Star/Star Destroyer, Home One, Yavin, Jabba's Palace. I wound up skipping Dagobah and Endor because I just didn't have enough figures for those spots to justify the space. But some of those other environments wound up being pretty big because so many figures needed to fit there. A Cantina playset designed with all the released figures in mind will be really big as a shelf display--I solved this by doing the bar as one shelf and the booths and alcoves on a different one.
The weird thing about this Throne Room is most of the display space in the set is behind the throne. It will look weird, but probably you can keep most of the "floor" figures on display in the Barge if you have that.