Lock-Tab FlatRoll, Hexagonal Column

Another variant on the FlatRoll column idea... this time with locking tabs.

Can't be 100% certain until someone actually tries to print one, but I think this should print out just fine (if I didn't forget an overhang of greater than 45 degrees somewhere), and the locking tabs should lock nice and firm.

The thickness of the underside is easily adjusted in Sketchup, and the precise value to use depends on how thin a single layer in Skeinforge is... a number I currently do not know.