Hi and welcome, before you start any project at the age of 17 you do realise you are restricted to a 125 and then when you pass your test you are restricted to a bike producing not more than 30bhp for a couple of years so I believe, so if you want a cafe racer start by looking at say a Honda CB250N superdream or Suzuki GSX250 Twin or any bike producing 30BHP saying that IED on here is actually building a CX on this forum so take a look at whats involved any advice or help give us a shout.