I am looking to build a bed from scratch, as i currently don't have one. My budget is maxed at $500 but the cheaper the better! I am interested in building a foam bed preferably with a memory foam top. The bed should be big enough for 2 people to sleep comfortably (queen?) I am 5'9" weighing 140 and my gf is 5'7" weighing 115, we are both side sleepers. I have found foamorder.com, but I have also found http://www.overstock.com/Home-Garden/8-inch-Queen-size-Accu-Gold-Memory-Foam-RV-Component-Sleep-System/4398172/product.html How many layers should I have and how deep? The mattress will most likely lay straight on the hardwood floor. Any guidance is appreciated, as I don't know much about foam and have been scouring the internet for a long time for diy stuff w/o any success. I also searched the forums, but didn't find much info from previous posts. Thanks!