Nice! Your collection looks lovely in there!
As a side note, and I always share this because of my experience.. if air can't get inside and circulate within the cabinet, please note that it may cause your ponies to stink..
Not bad like, a mold or mildew smell, but just like an old plastic type of smell.. That's what happened to me when I had my collection in a cabinet similar to yours, but mine had the doors on the front.
The ponies were good for about two years, and then I noticed the smell.. I had to take all the ponies and other toys out and air them out for a good while. They are now displayed on open shelves.
If you want to, try putting in some kind of air freshener, or even charcoal / cedar chips in the cabinet, that could potentially help.