- When we got our new apartment, we were positive that we wanted to spend most of our budget on a brand new natural latex mattress... In the RV, we slept on the mattress that came with it for too long and our goal - once we stopped moving - was to build our own mattress. I had done some research in the past, but now that we had our own place, it was time to put it all together - literally. Check out how we made our own natural latex mattress AND saved about $1000 in the process!