13 elements yagi antenna and azimuth & elevation rotator. Material used:

• 1.65m Antenna/camping balkon tripod from eBay
• 2000 x 15 x 15 allu rectangle tube for antenna beam
• two 2000 x 20 x 20 allu rectangle tube for rotator frame and azimuth axis
• ?x 8mm allu tubes for yagi elements
• 1x 12mm allu tube for yagi radiator
• plenty of M4 screws with nuts and washers
• 4mm plywood for rotator sides
• 2x TB6600 stepper drivers
• 2x NEMA24 stepper motors
• 2 endstops from eBay
• Wemos Lolin32 as rotator controller
• PLA filanment (ABS was bending too much for big parts)

See my github repository for ESP32 bluetooth rotator controlling SW.

I thing the building process is pretty clear. + Print the corners of the cube + cut the 20mm tube to 12 20cm long pieces + connect pieces to the frame + add 4 plywood walls so they fit + drill holes for axis slightly smaller then the bearing is + attach gears + add gear to the stepper shaft (I've just pressed it on. It's holding so far) + measure where to put steppers so the gear on the stepper fits + drill holes for steppers and screw them to the place + add azimuth and elevation axis and glue them to the place + endstops are on the holders (But are actually the only piece breaking when the gear overruns. The SW is still not using them.)

The only trick is the gear wheel assembly. I've split it into three parts to shorten printing time, risk and bending. And glued them together. See photos or contact me and I'll extend the description.