Single Comment

'The drawish-ness of 3D Chess is not predicated upon the turn order but
upon the material necessary to form a mating position.'
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In this instance, I did not mention the white-black-black-white turn
order
due to concern over the first-move-of-the-game advantage (by white).

The material necessary to form a mating position is greatly reduced in
games where a double-move is commonplace since, for example, having 2
moves per turn (instead of 1 move) can enable a player to strike any 
space on a 2-D board (if not too exotic in its geometry) with a 2-D queen
(a linear piece) within 1 turn.  Using planar pieces, I ascertain that it
is likewise possible on a 3-D board (if not too exotic in its geometry)
with a 3-D omni-directional piece (a planar piece).

In light of what I know now, you Smith brothers (no relation) have
devised
the only feasible and potentially, complete solution to the numerous
problems endemic to 3-D chess variants.  I wish you success in your
future
efforts.