Why build a fake? Surely better to have the real thing or build something different or more like the bike the SP was copying???
A fake will always be just that..a fake as it wont have correct frame numbers etc to fetch the premium a classic bike in the future would. I reckon if your going to build a rothmans bike that is not a genuine SP then surely its better to make it look more like the real thing? ie gold wheels, bigger rothmans stickers (like Micks), if your bike is original then keep it that way as it will be worth more money in the future...then again, how many original SP are their left still with original fairing, exhausts, airboxes etc?
Thats my thought anyway, and like Fontyyy said "Horses for courses" really!!