I turned an old trek 7000 into my first ss a few days ago. All I did was get some spacers and a six speed cassette, (this type screws together, so it easily comes apart). Use the spacers to align the rear cog and front chainring. If you dont have horizontal dropouts, either buy a tensioner, or use an old derailleur, just set the high limit screw on the derailleur so it is aligned with the sprocket. It works great, havent had it derail my chain yet. The extra gears from the six speed cassette can be used to re gear the bike for changing conditions, as it only takes about five minutes to change.

Oh yeah, they are fun! every one should try one!