RE: Sites for gas setup advice.
If the Dle 35 states it can operate in that range then a regulator is not needed.
You have to run an ignition kill from the reciever. Preferably after a switch or the BEC (any of them) will run the battery down when not in use.The Tech Aero Ultra IBEC is a good one, I have several. As for the battery, nothing wrong with some redundency if that is your likeing. I only run one battery for everything.