I would fall into the loner group also.
The last time I built the Z, I did it completely alone. (though it sucked putting in a tranny that is lying on your chest and while I am lying on my back on the cold driveway when it doesn't want to go in )
98% of it was done at night. I can think better and get more accomplished when its quiet and no one to interrupt me.
I have a neighbor that wants to help when its time to tune the Haltech.
With the family, business, and other obligations.. I have to make time to work on it, but when I do make time, I stay on it until I am exhausted.