Has anyone ever tried to add spacers between the PUP walls and roof to add more room when closed? I'm talking about maybe 2x6 or so sitting between the walls and roof (sealed of course) such that when the PUP is closed there is a little more room above the bunks. This would allow for thicker matresses, bedding, pillows, cushions, etc.. I was thinking that either using painted wood or some aluminum stock. Then add some additional lock downs like are currently used to lock down the roof to hold them in place and to lock the roof down to them. These could/would be in alignment with the existing lock-downs so the spacers could be "optional". Obviously, weather stripping would be inserted both on top and on bottom to seal the gaps. I haven't seen a post where anyone has done this, but was wondering.