Mechs in High Fantasy

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My roommate and I have been talking about ways to work mechs and powered armor into a game of 3.5e.
So far we've just been spitballing on how the mechs would differ between races
>Dwarf mechs would be quadrupedal seige engines, preferring defense to offense with heavy use of gunpowder based weaponry
>Human Mechs would be bipedal, working as an extension of ones own body. Think pacific rim
>Elves would have bipedal mechs powered by natural magic and would rely on ranged weaponry
>Drow have spiderlike mechs and would use speed and aggression, using 8 legs to close the distance and switching to a bipedal attack mode using 6 arms to maximize damage.
>Warforged mechs are more literal extension of themselves, using their life force as a catalyst to power what is essentially a much larger warforged.
>tiefling mechs would be constructed of dark metals and powered by lava cores
>Mechs will need to be piloted by magic classes only
Has anybody here ever run/participated in a game similar to this?
Anybody have any ideas?