I saw this

http://www.sailingsource.com/cherub/masts.htm

http://www.sailingsource.com/cherub/video/clips/Mast%20building.mov

I also saw another

http://www.harryproa.com/building_hg/buildinghg_wk14.htm

There was another good one, but I cant find it. I will post it tomarrow if I get the chance.