Dc-dc stepdown converters, NUC, servos and cameras
It is feasible , but even cheaper if you can use any PC ATX supply.  (Free surplus)

5V cams are avail here http://www.endoacustica.com/ip-micro-camera-wifi-streaming-kit.htm

3V LDO or perhaps 3.3V from PC PS will work on laser etc. 

Molex to USB breakout cable is easy to make for 5V and 12V. One just needs a jumper to gnd for Pwr On signal. (Easy to find)

If you supply servo specs/datasheet, there may be simple sol’n for this.