I just recently built a something similar with the honeywell y8610u4001 valve included intermittent pilot system. Google 2nobledogsbrewing and he has a good write up of how he built his system. I use low pressure propane for HLT and High pressure for boil kettle. I have a burner automated under my MLT but haven't found a reason to use it since Im running a HERMS. Check out ebrewingsupply for enclosers, switches, LED's ect. I went with the enclosure suggested by Kal on theelectricbrewery.com. I suggest using auber 2362 or any other model PID that can control a SSR so that you can convert to electric if you want in the future.