What about them?
Piltdown was a hoax that fooled a few British anthropologists for a while, but was increasingly ignored because it didn't fit the overall pattern of evolution. A few decades later scientists finally got around to showing why it didn't fit.
Nebraska Man fooled one fellow and an illustrator for a while. Big deal.
The drawings? Bah! Creationist exaggeration at its best.
If that's the best you can come up with against 150 years of evolutionary exploration and science you're not even half trying. Get over to AnswersinGenesis or one of those other sites and you can be an instant expert.
But don't expect scientists to pay much attention. Its already been debunked here: Index of Creationist Claims.
He can't hold a candle to Sirlinksalot on the other thread.