Well, I too find it hard to beleive it's "gone" in just 3 weeks - but perhaps this is an overstatement.
The first items removed would be the vehicles doors - as they are identicle on Star Tours and often need replacement due to wear and tear. Also, they would remove the plasma/flatscreen monitors and the infared cameras and send them to other attractions.
I would also think the projection systems would head to Star Tours for replacement parts - but the actual vehicles are contained within massive bays without any real large outside access. I assume those are still in place, but it's very likely that the interior could be stripped of the paneling, railings, decorations, etc.
Bwars vehicles sit in giant black boxes seperated by large black curtains/masking. So, demolishing/emptying the building would be simple, the main problem is getting the vehicle itself down and out.