You
can save money, but that's hardly never the fact.
It is good fun though, and you (eventually) get the bike just
as you want it. If you're only looking to save $$, a used bike
is the way to go.
Take a look at Rads signature (links), the 'complete RS build' sticky,
my blog, Patriots builds, ViperZ' builds............Building your own
bike is really something you can get hooked on.
I was at some point seriously considering investing in framebuilding
equipment, but my wife managed to 'talk' me out of it