I don't think anyone is questioning the possiblity of gaining 50lbs. It's the probability with the stated resources that's hard to accept. Your resources and time allocation are far more understandable.
For example, can a person jump 14 Greyhound buses on a motorcycle? Yes, it's possible, but could it be done with mopad?
Oh and for the record:
October 25, 1975 - Defiant after the Wembley crash, Evel successfully jumped 14 Greyhound buses at King's Island in Ohio.
http://www.evelknievel.com/bio.html
And marcus already addressed the cutting gear question above!
M.