To get you started heres a list of after market parts...
http://www.600riders.com/forum/fz6-streetfighter/3475-links-fz6n-mods.html
What I would do (Really what I'm planning on doing) is make it into a naked bike...
Slap some dual headlights on it (or what not), Some after market turn signals and some bar mount mirrors and you got yourself a legal bike that looks sexy and cost much less then rebuilding it to stock... Granted your son may want fairings on the bike which in that case really your only option is to buy OEM parts... possibly from someone that recently did a Naked conversion...
But anyways this is the set up I'm looking at
As for cost:
The Bike: $2,600
Light/Windscreen: $116 +plus a bracket to fit it (pretty cheap)
Turn Signals: $40
Mirrors: $32 + Bar Mount Bracket ($10)
Total for the front end: about $200 (not including shipping and tax and what not)
The gauge cluster (not sure if that falls in your "ect" pile) is about $320, cheaper then the stock @ just over $400 but still pretty good chunk of money...
As for the tank... mine doesn't need a new one so i'm not sure about that... I've seen some on ebay for 150-200... not to bad
But yea naked=cheaper :thumbup:
Hope that helps and :needpics:
Oh and :welcome: