John--
A Broad Axe is a matter of personal preference, if you havn't found it all ready you will recognize it when you pick it up. Heft, seems to be the defining factor for each individual and all three of those all important curves must be present. For the rough work, any 3 lb'er for scoring and I, among others of note, like a 5 lb Jersey pattern for juggling, the extra bit width is useful and that small beard helps save wear on your helves.
For a job of the size you are considering or for any more than a stick or three, two man scoring is the only way to go. Find someone with imagination and with which you share a mutual trust (all joking aside teticular fortitude and self confidence are requisites) and with the log just above waist high you each work alternate sides of the scoring notches. The ax beats fall faster and most all bending over is eliminated. Scoring is more than twice as fast and wear & tear on your back is greatly reduced. You can either juggle from the ground or standing atop the log this should be done within an 1/8th of the line, the Broad Axe being a finishing tool.
The hewing station ( the knuckleboom setting the log pile just behind ) is a set of inclined planes, perhaps 10% and maybe 16' in length, at this incline 2 men and peaveys can roll most any log up to working height, though you may need to parbuckle those 60's.
up. Four of these is a good number, 2 close togeather for the short sticks, the rest spread out. They can be a simple crib of logs or you can join something more permanant, A 2' flat at the up end on which to roll the log/cant is sufficient, This sees alot of wear so replacable bunks for a long term construction are in order. From there a forklift is what the philisophers call "appropriate technology".
Let me know if I can answer specific questions.
Will