Well, its a bit far off, but way down on the to-do list is a Small grid Satellite relay drone, which sounds a lot like what you're talking about ;)

But let me know if you come up with a design you're happy with, I'd be interested to see it!

These are neat! ^-^ I wonder if I could design a sort of combination ROV/Laser Antenna relay satellite to use one of these. (Like, a hybrid atmo/hydrogen vehicle with enough solar panels to not need constant refueling, that could fly to the edge of the gravity well and scout around.)

The tiny queen of Calpinis

Lightweight, with excellent fuel consumption.