I found this called Tranquility Sleep System. Check out this photo showing how they make it with different comfort levels of latex for certain areas of your body. Lumbar, shoulders, etc. I know someone here was trying to do this on his own.
Click on Tranquility Sleep System and then Click here to see illustration.


http://www.norwalkmattress.com/mainmenu1.htm



Norwalk Mattress Co., Inc.