Different Layers of Elevation on a Map?

[FireHorse]

Representing a slope is easy enough, but what if there are two levels at the same hex? That is, two hexes that share the same X and Y, but different Z — one is above the other, and both are clear to be occupied by figures.

I don't mean two completely separate layers, though. Both levels have clear lines of sight (and therefore combat) with other hexes that are adjacent to the lower level.

The situation arises in the design of a ship. I have a main deck, and of course there are decks below — but there are also partial decks above the main deck ('partial' meaning they don't run the whole length of the ship, just each end), and parts of those are not enclosed. This means there are places where someone might be engaged in combat simultaneously from an adjacent hex at the same level and by a hex one level higher.

The best solution I can think of is a separate map for each layer, and paying careful attention to which edge hexes from the upper layer "go with" which ones on the lower.

But man, that seems clunky and inelegant. And it also increases the amount of printing and cutting and crafty-stuff that a potential downloader of my ship has to do.

So I humbly invite better ideas, if anyone has any…