Hi, I was reading the Progressive Construction section & was wondering how I could utilize this method to my advantage? I initially planned to go the differential route, however after reading a bit more I thought that there may be some benefit to mixing a couple of different types of firmness in the comfort layer. I am still learning though and am unsure how I could go about this to suit my needs. I am 140 lb, side/back sleeper & was planning on doing a coil support layer with a latex comfort layer. I was also tinkering around with the idea of adding a wool topper. Any direction you could give me would be appreciated. 