After reading Sheldon's site on SS conversions, I would like to convert a vertical dropout frame to SS/FG via the ENO. Am I correct that the parts to purchase should be the ENO hub, a freewheel (WI), and a fixed cog? If I'm currently running a double chainring, do I just use the outer ring, ditch the inner, and use spacers to take up the slack? Lastly, does the DOS ENO allow one ring to be fixed, with the other one being freewheel? Thanks for the SS newb help.