does anyone know how many ranks in mechanical lore/enchanting we will need to make astral guides in 3.0?

>does anyone know how many ranks in mechanical lore/enchanting we will need to make astral guides in 3.0?

If it has even been set yet (I imagine specific item difficulties will be set last), they haven't shared it.

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Weapons for Sale:
http://www.elanthipedia.org/wiki/User:Caraamon#Wares
Hunta Talna Kortok, built by Gor'Togs, for Gor'Togs
http://www.angelfire.com/rpg2/caraamon/home.html
Combat Balance List:
http://tinyurl.com/DRBalance