Why make what you can buy! building a two piece mold to pull a female off the existing bumper and then another layup for the bumper its self, i don't see it being cost and time effective, unless it required to be a custom part that you cannot purchase.
After the OP finishes his bumper, he will agree with you.
I know STEFF wants other parts for his Road Runner, that are not made, so if he can learn how to make bumpers now, I'm sure a set of front fenders, and deck lid are in the future.
If that is the case, starting with an unavailable part would make more sense to me.
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
