The design is 2 layer, with top layer tracks in red and bottom layer in blue. Board outline is green and copper pour is red. At the bottom is mounting for 2 MCUs with the same footprint as an Arduino Mega / Due. At present, bottom right is inhabited by a TC275 - a 3 core MCU which runs at 200 MHz - perfect for controlling a relatively large number of motors.

Top left is a weird looking shape that houses the GPS module - a Ublox C94 Rover, which bolts onto the under side of the PCB. Bolting onto the top side is the SIM800 cellular module, a digital compass (bottom left) and some TFT screens (middle). There's also mountings for a couple of Arduino Nanos, a text to speech module and a 35W audio amplifier.