The whole thing? Calling it just a lighter frame and some aftermarket parts is silly and dismisses the bike's actual spec.
Someone want to make your own SL? Good luck having a mag frame sand-cast with correct stiffness and dimensions, that has been properly stress-analysed, and bolting it in with the proper fasteners to account for galvanic properties of the metals (unless you really like corrosion).
Good luck finding the dedicated cams, don't forget to add ti exhaust valves or the profiles will be too aggressive. Good luck getting a comparable crankshaft and 2-ring pistons, and setting up the motor so that it has some reliability and streetability. Spend some time on that squish area!
Better get on the phone to Europe and call Ohlins to see if they'll sell you the custom forks, Marchesini for the wheels, and ask Brembo when their MCS master cylinder will be available.
Also, you'll want an electronics guru to develop anti-wheelie, lean angle data acquisition, and auto-calibration for the rear wheel, as well as some dedicated control buttons. Make sure it all integrates perfectly with your existing stuff.
Next you need to call your carbon guy, and get him working on a subframe and fairings. Keep your fingers crossed that those are made to OEM spec.
Then comes the machinist to duplicate the billet aluminium footpegs, triple clamp, radiator cap, and a few small other things. Hope he's also experienced in working ti, because there are around 130 bolts fasteners etc that'll need to be created.
Most of the rest of the stuff, I guess you could call aftermarket parts. I'm sure someone sells the MotoGP chain, SBK sprocket, ti shock spring, remote brake lever adjuster, etc. The TTX36 shock and lithium battery should be easy to source, the two full ti street and race Akrapovic exhausts a little less so. One thing's for sure - keep your checkbook open and your schedule free.
Ironically, you actually won't have to call your sticker guy, save him for when you build an Aprilia.
When it's all said and done, I guess you'll have a reasonable facsimile of the SL. It would be nice if someone would offer you a warranty on it, although I think that's unlikely. And hopefully if the time ever comes to sell it, you find a prospective buyer who appreciates and values your creation just as much as a true, numbered factory special, and will pay a comparable price. Or, if you want to spend another huge chunk of time parting it out, maybe you won't eat too much depreciation on the parts!
I'll keep my fingers crossed.....
