"How heavy do you estimate the completed mill to be  less blades ? "

I expect upwards of 200 pounds - just guessing.  heavy - well have to hoist it, or assemble it on the tower top.

"What will you use for the yaw bearing ? Mine is pipe over pipe with grease fittings and a  1/2 thick steel washer / welded on top as the bushing, the inner pipe is thick walled with very little slop and the unit is very nearly balanced and so far it is very smooth operating. "

Ill probably use a thrust bearing of some kind.  The steel washer like you've done would probably work OK too.  On matts we put in a throwout bearing from a clutch - that worked nicely.  I'll probalby look for something like that.

"I am using a rear tapered wheel bearing hub from a mini van that is plenty heavy enough for my 12' rotor but it is really hard starting in cold weather with regular wheel bearing grease, are you using different lubricant ?"

Ive heard complaints of that before - I've never noticed any problem with it personally.  I wonder if part of the problem is the fact that you have a single rotor machine, the bearing is allready under a fair load from the magnets attracting the stator.  You probably have some (though it may be minor) drag due to iron losses as well.  Just a little bit of drag like that will make it much slower to start - even if it does turn in a light wind, it will take much more time to come up to speed.  I question if it's the grease though - I've not noticed any affect from that in cold weather.

 "Also, what do you use if anything to help keep the blades from icing up ? Sorry for all the questions but you have extreme conditions there (as do we here in Western NY) and when this goes way up later this Spring it's going to be a little tougher to mess with than 10' off the ground as is now. "