Okay... the occulus sounds good.
Okay... the Gnomes seem to focus on lots of hiding and killing enemies before they even know they're there.
Is there some kind of, I dunno, way to build hidden tunnel entrances? Doors that enemies have trouble seeing? The idea I'm seeing with gnomes is that they have complex reactions that take a lot of stuff to build, but super simplify things once they have them done.
Secondly, I think they'd work by having combos. So before you could build say the weather control station, you'd have to 'invent' it from taking 'studies' of two other work shops (which in turn were taken from studies of two other work shops, and in turn from studies of two other work shops, and so on and so forth) until you got to that reaction.
A study would be a specific type of reaction. Similar to the architect's action when setting up a place to be built. They go in and they occupy the building, it can't be used while a study is ongoing. The study is studying every aspect of the building. Once done, it produces a [Workshop Name Study].
Two studies from different buildings are brought together to help invent a new building. Sometimes they don't produce any new workshops.
See how this would give gnomes their own unique way to work their way up the tech tree.
Now, anyway. The idea is that as you work your way up the tech tree, you get bigger bang for your buck. But buildings higher up the tech tree are more and more expensive to build. Rather than magic you have stuff that produces cool effects. Like generates and hurls magma (magma cannon), or acts as a water generator, or a contanminent mister.
A big thing for a lot of their traps and creatures should be some kind of 'hidden' skill. Like how magic users can cloak themselves. (If this can be applied to door ways and stuff, all for the best).
Gnomes should have shit armor, but freaking scary weapons that are almost certain to kill or maim on the first hit, but take a long time to reload or between shots. Weapons meant to be used from ambush or for hit and run attacks.
edit: Another thing would be some kind of, I dunno, hunting blind. A type of fortification that's hidden and so you can build without having to channel infront of it to shoot out of. The idea would be to conform as much to the landscape as possible.