Firstly a huge nod of thanks to @Jason Snow for creating Otto Wheels; it is a lovely Otto bot and was a perfect platform to showcase the Pico. I wanted to make one when I first came across Otto, so hopefully this is a fitting tribute. Any design changes I made were minimal to accommodate the board in Otto's body and the power supply in the head.
I can provide much more detail later if people are interested. Briefly, Pico Wheels has a RPi Pico (no surprise!), the Kitronik Pico Robotics Board (https://kitronik.co.uk/products/5329-kitronik-compact-robotics-board-for-raspberry-pi-pico), two 320 RPM, 6V N20 DC motors (the 60 RPM ones I have would have been a better choice), a little piezo buzzer and the classic US sensor eyes.
The Pico is running MicroPython and the IDE I use is Thonny.
This is a VERY basic demonstration, but it does show an RP2040 board inside the classic Otto head and body. I briefly cover the build, the code and show that it actually works!