G'day from Australia,
I've been having a look around the last couple of months trying to get ideas for where to get, and how to install an RC rangefinder for my Rex build I'm currently in the process of. I'm also chasing a circuit board to add leds to the rangefinder.
Unfortunately, work on Rex is sporadic, due to me working in the mines in the north west of the country- 2 weeks on 1 week off -so the week off is flat out and I usually go back to work for a rest, rather than the other way round!
Most of my posting is on the 501tag forums, which is where my Rex build can be found.