The lower most portion of the cabinet below the microwave has a false door, behind which is the Water Heater plumbing. But there is still storage available, if protection is provided for the plumbing. Great place for the Central Vac Hose & Attachments.
The Sub Woofer, located in the right side of the lower TV Cabinet, has a dividing panel right in front of it. I cut the dividing panel to fit up to the side of the Sub Woofer enclosure to expose the Sub Woofer.