While your waiting for coach here is a Owners Guide
so you will know all about the systems in your new Newmar.
If you have your LCD in that space
would say the cabinet is about 30" by 16", shelves inside maybe 12" deep.
If its a cabinet pantry would have roll out shelves which would be narrow after the slide out hardware was added.
Congrats on your new Newmar many safe travels for you and yours.