As far as the will-build-to-suit is concern, yes some the office area could have been demoed, thus enlarging the warehouse/assembly area, but that would have taken time. Remember, it was a couple months ago we were shown the eBay oven being unloaded at their new warehouse, a different facility than this one which, according to Jody, they started moving into yesterday.
As far as has been discussed, and as far as I know, the first run of ASICs out of BFL will not involve use of the oven or pick and place machine. If this is the case, all that'll be needed in the next month or so for product assembly is a pretty simple final-assembly area.