New Enclosure

[Lasher]

Hey Guys and Gals.
I need your help. I am again constructing a huge playpen for the large boa. This one is going to be the last one (I hope). It will be open air in a temp / humidity controlled room and will be 3’X 6’ X 6’. It will have a full size walk-in door and a pullout substrate drawer for ease of cleaning and maintenance. Here is my problem…. I am drawing a blank on designing the interior. I want something that she can climb on, but that does not make the cage too heavy. Can someone include pictures of their enclosure’s interior so I can get some ideas?
Thanks