Couch as built from the factory.
The only thing under the couch is the furnace, duct work, and part of the wheel well. There was no access to the area.
Couch kick panel removed. The panel just hung in front of the couch, with a cutout for the furnace air intake.
I used a utility knife to cut out the paneling. I removed the center brace, it was not supporting anything, just bracing the paneling.
I framed the opening and removed some staples from the fabrinc on the kick panel. I pulled the fabric back from the cutout for the vent, and cut the panel into two sections. I used one as this door, using a section of the removed paneling to cover the back side of the door.