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I've been looking at it for months and wanting to get a game in on it. I'm usually playing large three player Maelstrom battles, but that's all flexible. I'm Word Bearers, my regulars are Space Wolves and Tyranids. What might work, here?

I'm thinking...

Stuff like minimum sized units only, as the task forces are dedicated to underground combat.

Night fighting rules, maybe?

Bikers and Cavalry have to take tests not to fall off when Advancing along walkways, with worse odds if turning around corners.

Rules for jumping across gaps. Something that makes faster units more capable of doing this. Perhaps automatically pass tests to horizontally jump half your maximum move? Or perhaps limit horizontal jumping to no more than this? Maybe for every inch beyond your minimum p, roll a dice, for each 1 a member of the squad falls into the lake and is removed? Taller falls should be more dangerous - maybe autohits at str=distance fallen, -1AP for every 3" fallen?

Arriving from reserve other than onto the landing pads or from a table edge is dangerous, on a 1 each member of the unit dies as they miss the walkway. Jumping down onto an enemy model enables a death from above attack - roll to hit, and if successful then the enemy unit takes the falling damage instead of yourself! Units with FLY can re-reroll to hit?

Abseiling and climbing down ladders working different to jumping down and climbing up. Going down a ladder, each inch is half price. When climbing without a ladder to an overhead walkway, maybe... make a hit roll for all of the unit's close combat attacks. For every hit, a member of the unit successfully climbs up to the higher level. Minus one for each 3". So, you've got to be pretty strong to throw ropes up and climb them quickly, and if half your squad is already up, they'll help pull you up.

Just some ideas. If anyone's worked on some rules for 8ed dense terrain combat, I'd love to hear them!

Looks like a map that favors small, elite/shooty armies. Orks/Tyranids would be heavily punished just for existing on this map.

The terrain looks cool though.

You could borrow rules from Shadow Wars...

Wanted to begin by thanking you for fully embracing the concept of 'scratch built Terrain Datasheets.'

The largest problem I foresee, particularly with larger-Units, will be the constantly evoking of 'Wobbly Model Syndrome.' To address this problem I suggest that you make modifications to the 'Unit Coherency' Rules for any Model standing on this piece of Terrain. Even doubling the coherency values will allow larger Units to spread out across multiple platforms more easily, and thus less Models will have to 'hover-midair' just to maintain coherency. It might even be the solution to a lot of problems that come with moving across this Terrain piece, simply allowing the Unit to spread out more gives each individual Model more room to move in.

Also; keep the terrain Datasheet as simple as possible... a lot of complicated Rules will only ensure your opponents never allow you to field this terrain piece.
Added - Have you considered this Terrain is perfect for Kill Teams?

With regard to unit coherency - page one of core rules lets you have 6" of vertical distance on top of your 2" horizontal coherency.

I think y'all right to worry about larger units, hence the stipulation that units are only fielded at minimum size. Tyranid hordes will probably fare poorly, but Gargoyle mobility and Genestealer, Warrior, Ravener, Lictor and Carnifex commandos seem very well suited to tunnel warfare. Likewise Orks are going to want to send Nobz, Kommandoz, Burna Boyz and the like.

Simplicity must of course be key, this is not 2ed and we don't want to be rolling dozens of D10s every turn!

The terrain certainly looks great for Kill Teams but we're not going there until Necromunda drops, it seems fair to assume that'll be a treasure trove of ideas to use for skirmish. For now, we're thinking about sticking to proper Squads.

True, and it was more the Horizontal I had concerns about.
If this game was better written, I would recommend a Rule allowing Units to split into smaller Units while on this terrain... alas that can causes strange things to happen if the Unit was not already designed to split apart.

Added - While trying to think on a few Rules that might break, or at least how certain formatted Rules would break as I am not going to review every Rule in every book, I started wondering if the list of oddities was smaller then I feared. If Units on this piece of terrain where allowed to split into, say, three man teams... would anything even break? This Edition was re-written to make actions more dependent on the individual Models after all, one Model already can shoot multiple Units if armed with enough dakka for example, so it is an interesting line of thought. There would need to be a Rule preventing these smaller "Teams" from leaving said terrain, at least not until they have joined back up with the rest of the Unit.

Could be your answer to large Units, simply allow them to operate as smaller teams while on this piece of terrain.
I even like the image it brings, the terrain becoming a smaller battlefield within the larger battlefield!

Yeah, something allowing for coherency to split across a gap. Good catch. We've had some funny situations with Tyranid conga lines to Tervigons - this definitely needs to be considered.