Thanks. The DC rotator makes quite a bit of noise too though, more than my regular diseqc rotors. Mostly the azimuth because it is not easy to increase the PWM frequency. The satnogs PCB uses the PWM pins of Timer0 for azimuth and when you want to increase the frequency the clock runs too fast. And the clock is used in the PID library, so you end up having to change code everywhere to compensate. Or change the default library.
The noise mostly happens when the PWM is too low for the rotor to move. It could also be removed by creating a deadband. When I tried the stepper motor it also was quite noisy, but I think that is because by default satnogs uses full stepping and not micro-stepping. Never tried that in the end to hear the difference.
The elevation rotor is running on high frequency and is quiet.
The alu extrusions are from the suggested supplier Motedis (http://www.motedis.com/shop/). I had them cut to size which was quite convenient.