Wow, it looks huge!
I would add some structure like small hills and flagstones,... better do it now when it's still plain soil and let the plants grow around it.
Looks like you are off to a nice start!! Looks like a nice big pen! I like the half cinder block hide idea! How big are your leopards? Pictures? My leopards are still just small.
Looking great. If your avatar pic is the size of your babies, they need to stay in a closed chamber at least until 2 years with only short visits, an hour per inch in length outside.
My leopard’s are a little over a year old now. Dipper is 706 grams and Mable is 495 grams.
Wellington 99% of the time they are in there closed chamber closure that I try to keep the humidity a minimum of 75% and temps: Go as follows, 78deg at night and anywhere between 80 and 95° during the day.
I’m starting to drop the night temperatures down to 75-ish.