there's something like that out there called 'Doga'..it's robot  and spaceship parts,  and it's just the thing to quiet down young men (8-12) when your co-workers leave you with 'baby-sitting' duty. There's a free version., and 2 spendies..you get to assemble, rotate, and export (as .dxf, but whaddayawant for free?..;)

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)