I just ordered the Streamline folding bunks here
http://busrvparts.com/bunks-fold_away.htm. I was going to build some bunks myself, but after being accused of nickel and diming, this was just easier. Haha
$270+$35 for custom sizing (76" bunk is too short for my comfort)+$70 or less for shipping. I'm getting a king size 4" memory foam mattress topper and cutting it in half for the two mattresses. Estimated total cost will be less than $500. Good video of the folding bunks:
https://www.youtube.com/watch?v=XiN_vVOy-mg