Yes the separate parts could probably be sold for more than $1,000 if parted out, but this is a project and the only way to keep the eventual cost down is to buy it cheap. If you pay $1,000 for the rolling chassis and another $1,000 for the missing bits, for the same money you could probably get a rough but complete bike with matching numbers. When complete running machines are going for around $5,000 you need to be very careful not to build a $15,000 beauty that is actually worth 1/3 of that!