This is my miner It was a craft file I got as part of the Space Station Kit from Spaceport Link - http://kerbalspaceprogram.com/0-18-4-space-station-kit-2/ I modded it with Fuel Balancer and batteries from the Hybrid+Ion pack mod. But the way it's laid out is simple, Small converter on top, not attached to a tank, fuel lines run from it to a fuel crossfeed capable truss, more fuel lines run from the truss into a flat 2.5 meter tank, then from that tank out to the 4 tanks my engines are attached to. Again the fuel balancer mod makes sure all tanks fill evenly while I'm converting. I also have a Quantum Fuel Transfer mod on it so I can land a tanker next to it and produce fuel and ship it up directly if I want, as well as a Merlins Kethane transfer device on it so I could fill other kethane tanks. (Still playing around with how exactly I want to run this)