BAH! Even if I get multiple sets at once, I still power through the builds because I am too excited to build. None of this dragging it out stuff! I build something, then at the end I am like Agent Smith: "MORE!"
That would be a BIG logistical nightmare. But fun at the same time. Not to mention it would take forever. That Fire Brigade/Town Hall combo build was hard enough to find space for. Now double that? *shudders* Give me time and I will probably do it though.
And if anyone hasn't seen that build:
http://www.youtube.com/watch?v=Bb_5AS5W-xU&feature=share&list=UUGitvow7KdL-ANexCwl-nvg
When doing a set fresh, I just have a container for each bag. When doing rebuilds or time lapse, I have a container for piece types. Meaning I have a container for nothing but tiles (no studs), and a container for all the 1x1 pieces (round or square). One for all the 1x2 bricks, but with the 1x4 bricks mixed in. If I am mixing pieces I make sure it is three or so different types that can easily be identified by just glancing. Basically mix a bin with 1x2, 1x4, and 1x6. Then another bin gets 1x3, angle pieces, and 1x8. Cuts down on containers and still gives me some organization.
The issue with trying that with 10k pieces is simply how many containers it would take, and then the footprint of four large baseplates as well. The more I talk about it, the more I wanna do it.