Haynes Manual Build a Robot

[Ocracoke]

Nothing ventured, nothing gained. For a prototype robot (and as a guide for cutting in HDPE), nothing wrong with a bit of MDF or plywood.

Sounds simple enough, should i start with 20mm thick all over? Or maybe thinner for the base and top?

This is up to you. I've done both where the thickness is the same all over with The Honey Badger and Shu! but also where the base is thinner with Kaizen. I would only go with the thinner base/top option if weight was a concern but since it isn't here, I'd go the same thickness all around.