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Game Courier handles hexagonal boards by basing its coordinates on only two
of its three axes. Since the board is still two-dimensional, this works.
See my earlier comment with examples. Other 2D boards can be handled in a
similar manner.

Game Courier assumes a board is two-dimensional, representing all
positions in a two-dimensional array, but it could fake a 3D board. For
example, a developer could represent two of the boards dimensions as a
single dimension. Since Game Courier is not designed to draw 3D boards, a
3D game would have to use a custom board.

As for my proposed V-FEN standard, since / by itself cannot be used as a
shortcut for an empty rank, it could recognize //, i.e. a single /
following the / meaning end of rank, to indicate a drop in plane. The FEN
code would start on the top board and proceed to the bottom board.