Reaching back into the deep bowels of this thread, here's my aluminum stock looking column if you haven't seen it already. Had it made as a one of one since it was a case of twisting elbows to get it turned on a lathe by a very busy machine shop.

Aluminum Tie rod sleeves is another plus to minus the pounds.

You can get shouldered 1/2 X 20 titanium lug nuts at a company called Met-Tec here in the states.
Ti64 is another firm that has the acorn type tapered seat lug nuts in titanium.
I also know of aluminum tapered front lugs from a company called Mcmasters in Chicago. They are nation wide for distribution though.