How'd ya guess? I have wondered what a dwarven mecha would be like. Like a dwarven version of the Gawain, Mordred, or Shinkiro. What would they do to it?
Anyway, I'm contemplating what horrible thing to do.
I'm guessing it'll be a fair few main releases before vehicles are implemented.
I'd imagine any vehicles would be a question of allowing the physics system to deal with things bigger than one tile moving around in a (semi-) controlled fashion, and mecha would require fluid (rather than radial) joints for the hips (and shoulders for that matter), or the legs would work but the thing would never move forward.
Power plants would be pretty simple if steam power were implemented, I'm thinking a dwarven nuclear reactor and a windmill setup, if dwarven physics remain suitably far-removed from reality that might even work indefinitely with a condenser.
Float Systems are right out, at the very least until an entire lift/drag system is implemented, and we may be on Pentium 10s before that
can ever happen, what with all the calculations that need making. And Landspinners might be impossible to do owing to weight, unless the chassis are made from Hidden Fun Metal. (Wood is another option, but they'd be fragile.)
Conventional weapons should be doable with remotely-operable siege engines and individual item physics (a device comes to mind that pushes a single ballista arrow/stone onto a hatch that then opens and drops it into the center square of an engine linked to a cockpit lever) and hadron cannons and the like would be equated by dwarven coilguns, which would require some simulation of electrical current and magnetic fields.
Druid Systems however are already implemented
Floodgates disappear entirely when not in use, link 'em each to a lever and you wouldn't even need a genius-level intellect to activate the appropriate ones owing to the pause button.
Yeah I give these things way too much thought. But then isn't that why we're all here...?