Update**
After using this platform the past 4 years, I've modified it several times. Current version is much lower with 6" tri-fold memory foam. I take the rear seats completely out for maximum gear storage. Just finished trip to Big Bend.
Thanks. I used this forum to formulate the idea. This 3rd gen thread has a lot going on in it. There were some other good threads but pics links don't work anymore.
I have looked at others sleep platforms and decided to build one myself. I want to post the exact dimensions and major supplies, to save others some of the leg work for a 5th gen 4Runner. This will make an 80" (6'8") long Sleeping Deck with front seats all the way up, rear seat back folded down...