the built-in bookcase shelf wall is such a great idea. the shelves are different heights and would normally end into a wall. Keeping the right side open creates a larger room, and force your eye to look at your collectables. How to display your shelves.
Full height cabinetry allows for easy concealment of brooms/mops/vacuum cleaner. Having the washer and dryer separated creates more benchspace in an already tight area. Perhaps framing the dryer with cabinetry would create a more streamlined look.