You think Nov 2004 is current?
I will bet you that the aircraft as it stands on the tarmac at this moment accounting for fuel is heavier than you think.
When an aircraft is weighed it is stripped to the bare minima as required on the MEL. When it actually goes flying it has people in clothes, headsets, GPS, maps, flight bags, flight guides you name it the crap that gets put in an aircraft is endless.
When I was newly qualified I had such a demonstration made to me by an Instructor in a 152. We weighed ourselves and all the extras that were in the aircraft and my W&B was more than 40lbs out on a 152.
I teach the same to my own students these days and the look of suprise on people face when they do a REAL W&B is a delight.
I am not saying you are not heading in the right direction, I am just trying to point out that you should not be so cut and dried in your thinking. As an Instructor I would question your calcs claimed in an earlier post and ask you to produce a full schedule that would convince me to take 4 adults and 4hrs fuel in a warrior.