Even so, if we get sufficiently movable fortress sections, you *know* that someone will try to hook up an ancient dwarven adamantine battlemech with magma blasters.
Hell, that "someone" will be me.
Well, actually, I'd make it from stone, and I'd probably make it use windmills for power just because I could, although water reactors would work just as well. And I also want the spider walker to have marksdwarf pods where they sit in bubble "turrets" of battlements surrounding a stairwell. Presuming we don't have the ability to turn pieces of fortress, there will need to be two sets of legs - one for moving north/south and one for moving east/west. That will make "spider walkers" more likely. It depends a bit on the size of the moving components, but I could sketch one out right now based on what I expect the pieces to look like.
But anyway, moving pieces is something that will let players do all sorts of really crazy things, but which don't really alter the timeline, it just abuses the heck out of the loose physics of the game. After all, that walker will be standing on one or two legs that don't need to be balanced at all, and where I can make the entire body out of stone, and the legs out of soap, yet it will support the weight of the walker just fine. There are some things that are just silliness, but because they don't dramatically impact the feel of the game unless players really want it to, it's OK.
Royal Jelly isn't really realistic, but it doesn't change the game much by being there. Making gunpowder and steam engines changes the setting of the game.
It's hard to have a world where adventurers fear the shadows at night when alone when at the same time, they are waxing their handlebar mustache and setting their phasers to "vaporize bogeyman".
Top hats and monocles are silliness that changes the feel of the game, so I wouldn't want them in vanilla, but would be quite happy to have the option to mod it in.
For vanilla, something like a jeweler's lens or a spyglass wouldn't be totally out of character with the game, if potentially a little anachronstic, but monocles are just silliness for the sake of silliness.