I like to keep it simple and don't use any expander boxes or regulators. Usually two 2300 A123 Packs into the RX. One on a Y to the 7008SB and the other on a Y to the S.Bus2 port (doesn't really matter where as they all wind up in parallel). I use the 8 PWM outputs on the RX and any channels in excess of that I use the Futaba S.Bus to PWM 3 channel converters. I don't have any S.Bus Servos.

Sometimes it's nice if you have a collection of servos in one area to use the PWM converters close to where the servos are and run the 3 wire extension to the RX. Robbe makes a 4 channel PWM converter and on the Flash I'm building I'll mount that in the wing (RtFlap, LtFlap, RtAil, LtAil) then I'll just have the one 3 wire connection to plug in when assembling the plane at the field. I'll go up a wire gage or two on the Red/Black wire just for insurance as I'll be powering 4 servos with one wire.

I've put together 7 jets so far with this setup and have never had a single glitch or hiccup.<br type="_moz" />