Two desks and the ceiling is where all of mine reside in the woodshop that's become more rocketshop on my side. I should do like you did and put some in the chair space under the desk except...that's where all my body tubes are! Looks like you've got a good collection; I've got to get pics of mine..I can't exactly fit them all in one shot though. I agree though; lots of room yet to stash more, you just have to get more creative The problem with desks is that if I go to get one in the middle it's hard to not have the domino effect of rockets starting to fall...that'll scare ya every time.
Is that foam you put down on top of the surfaces? Must be dense stuff to keep rockets from tipping over.