In this question: How does SpaceX manage parallel processing at the LC-40 Complex? I asked how SpaceX handles two cores at the HIF building at LC-40 at the same time. Based on available data it looks like they just do not. One at a time.
I asked this question on the Space Show with David Livingston when Gwynne Shotwell was on and she misconstrued my question, instead answering that LC-39A, Vandenberg, and Boca Chica will allow more capacity.
Recently in March 2015, there was a scheduled launch of a GEO comm sat on a booster with no legs (due to lack of margin for landing attempts). Followed by a CRS-6 mission about 20 someodd days later, per the schedule. Due to undisclosed issues, they have swapped the order.
Thus the question is now, how will they handle re-arranging the flight order. Will they fly the CRS mission with the commsat booster, no legs. Then fly the commsat mission on the CRS booster, possibly removing the legs?
Will they retrofit the legs back onto the commsat booster for the CRS mission?
Will they just move the commsat booster onto a truck and park it outside, off to the side, or somewhere at the Cape, and start work on the CRS booster?
The HIF building may be big enough to slide a booster over to the side, if only for a week or three.
But it would be interesting to know how they plan on handling this changeup.
Update: It is possible I misunderstood the delays. This article at SpaceFlightNow suggests that they are just delaying the commsat launch, and possibly push back CRS mission after it, not reordering it. I will continue looking for the original source I was working from.
Update: This NasaSpaceFlight.com article suggests that the ordering has been swapped, with CRS-6 going before the comm sat. Which to believe? Who knows, but the question still stands.