Belts, motor, sensors, circuitry, wheels, some basic metal or sturdy, but flexible polymers for the framework. I might also do something with hover tech to replace some of that. Should be quieter that way too.

[Her world was a mix of damaged and dilapidated tech and polished high tech coming from the evil geniuses employed by Apocalypse. Plenty of it was also "borrowed" from alien cultures. The X-Men had "liberated" quite a bit of it, so she had a diverse and skewed background even before Marina where she learned some of their native tech and learned from others like Chekov.]