The bottom and back cushion sections are connected to the jackknife mechanism by 1/2” nuts. The mechanism is anchored to the wood frame by a couple of screws, ours had four each side. After that the plywood cover is held down by several screw around the perimeter. When we opened ours we found the water pump, water tank and had access to much plumbing & electrical on the drive side. Our 5210 had the dinette we have removed that. Our plan is to add twin beds.
Appreciate the info!