Hrmmm... Tough call. There has been some demand on occaision, but I don't know if it is enough to justify a full on business adventure.
Gotta remember, at minimum, you will be dealing with cars that are 17 years old, and there is only a 5 year window for vehicles, not even counting that they fiddled with some bits in those 5 years.
Sure some parts will cross over to Pre series 1 (LN3), but not enough to justify it me thinks.
Best way to tell is do your research, and as you build your car, anything you custom make, have extras made to sell. That will tell you a lot.