Very nice observatory!
hopefully the weather treats you well, so you can enjoy observing in comfort!
The best carpet to get in my opinion is the carpet tiles (Synthetic type) I got mine 2nd hand for a $1.50 each from an ex-government shop. They are water proof, rubber backed and very tough wearing.
I installed mine without glueing it down, so i can lift a tile out if it gets dirty and jetwash it clean, takes a day to dry, then you can reinstall it again
