Ironically enough, in canon Doug is a dwarf and is expected by everyone he meets to know how to forge weapons and equipment but HA, his father died before he could learn anything about the craft. I've been planning on mirroring that with engineering so oddly enough he'll have something to stark this old man over.

He's tiny and knows his way around Old City, he can fit in most of those cracks and with the right sort of manipulation or however you'd like to go about it we could maybe find Eggman the parts he needs.