This project is to be a semi-Retro like robot kit for 3D printing and designed for the RoboGuts™ S.T.E.A.M. education program teachers help students find answers, solve problems http://www.R2Pv1.com/
The main body is NOT large enough to host other MCU boards and have the same capabilities of the RoboGuts™ circuit board which can host most common MCU chips like the ATMEGA 328P found on an Arduino or my favorite, the PICAXE 28X2 module ...