Yes, I took the panel off and created a little cubby there. Use some light weight material and you can make a shelf. We keep out hats/gloves up there. The key to this trailer is to keep modifications light in weight, as there is not too much cargo carrying capacity.
Also I mentioned in my prior post, there is also room below the sink -- just remove the false wall near the plumbing. Same with the false walls under the bathroom vanity. That is a little tighter, but you can still store some soap, TP, etc under there.
2014 Ram 1500 Quad Cab Big Horn
2015 Jayco X23B