Look at the video Joe posted. There's next to no backstage space to store any set pieces, props, etc. Of course, I guess it's possible they could drop an extra storage pod behind the Soundstage and next to the elephant door, but then an issue is that the door would need to be open during shows, which just can't happen do to HRRR. If they really want it to happen though, I suppose they could just add on to the soundstage a bit in the back.