A 3D printer (or at least access to one).
3D files are posted here.
A Raspberry Pi.
At the minute project is set up for a Pi Zero W, but the same print can run a model 2 or 3 as well. Details to follow.
A 16G SD card (4G will work, but video eats up disk space!)
A Pi Camera adapter (You may not need one of these, depending on configuration).
A Ball bearing (Fidget spinner size!). A 608 bearing is 22mm total diameter, 8mm bore and 7mm width.
Lots of m3 nuts and bolts. I got these
Battery or micro usb power supply.
Some soldering and might be some drilling (3mm drill).
Another machine to log into PiSkyScan with an sd card reader.