>>903Probably the best way.
>>901Probably a cheaper way, especially if you can't build the controls for a mirror like that. Although, with the right software and two 555s and a servo, you could probably control the mirror fine- that's not a bad electronics intro- do you have any technical background at all?
If you want to stream data from webcams, my advice is to not use a raspi, its USB stack is crap (as in, it has documented bugs but the chip manufacturer gives 0.0 soykafs). You could probably use something comparable, though (cubieboard, banana pi- not actually sure raspi 2 has any bugs), many go ahead and compress data onboard so you don't have top sweat bandwidth- 480 Mb/s on a single port is fine.