Custom Sphero Chariot and Trailer. Completely customizable.

Needed a sphero chariot for a project. Used "gopro" style connector so i can adjust heights and added pivoting hitch to the trailer.

We used these for my class' projects, and just wanted a different style, i also used these wheels.
https://www.youmagine.com/designs/lego-train-sphero

for the hardware use:
* M5 bolts (at least 20mm, 25mm if you make your own knobs)
* M5 8mmacorn nuts