Scotty, nothing I said to you is an argumentum ad hominem. Just a friendly primer in the behavior and tone we are used to here. I intended and intend no slur on your personal style. However, I generally find that a polite tone and trying to conform monkey see monkey do to the general culture you are entering for the first time is more effective in obtaining the results I want (information I don't have, gentle conversation, spirited debate, a soapbox for my humble opinions) than trying to impose myself inflexibly on that culture.
You seem quite intelligent. Probably well beyond the happy 140's, where you're smart enough to excell over your peers, but still dumb enough to be able to communicate and interact happily with them, without too great a degree of impatience. It's a tough learning curve to be part of the crowd if you fall above that relative intelligence benchmark. I take great interest in watching how guys like you do at that trick. Fail at it and it's like having way too much hp for your traction - you get nowhere.
Hang around for a while. It may get interesting. I find praticing anthropology to be one of my all time favorite pastimes...
BTW, while Harrier is dead right in the real world, I still think you haven't accounted for fastener diameter anywhere in there, but I buy the rest of Frank's stuff, and as Big Blue has stated before, You aren't going to get all that close with the best torque wrench YOU can afford anyway.
Scotty, forgot something. How are you going to adjust for the fact that every time you torque any one spoke, the previously applied torque of every other spoke you tightened will change? I'd get the hub centered with about 8 spokes tightened, using a dial indicator, then criss cross tightening pairs or quads (probably quads), then run the circle all the way around and adjust, then check hubcentricity again. Left out the dial gauge part on the "masters" anecdote above, sorry. They told me "round" is more important than tension, as there is a much smaller allowable variation in runout than there is in spoke tension.
Oh, and if you want to eliminate the correction for extension altogether, use two lateral extensions of equal length plus a long enough extension to clear the rim, and put the axis of the torque wrench square on the axis of the spoke - tack weld common spoke wrench in t/wrench axis hole of bottom lateral extension. Like the offset handle of the common brace and bit, if my explanation was unclear to you.