Hi all just to add this.

One more point to pcb and supply smothing is to use a diode in the supply to
the servo's with a large cap to supply the current these need.
The caps supply the cuurent and the diode's stop the rest of ciruit taking
voltage from servo being feed.
Modle railway point's are feed this way save's having to have large power
supply.

Regards Art

---Snip---

> If possible, it would be great to have one regulator per servo (ie, do the
12V
> to 6V drop right where the servo plugs in).