Here's a photo of the wheel and hub:

These 6.5-inch diameter wheels are sturdy, their drag can't be huge, and it could be made smaller if I bothered to cover the holes with tape or something. They also keep the basetube off the ground during setup so it doesn't get scratched.
There are a few little issues to be aware of. Unless one chocks the wheels, one cannot use the keel-stand while breaking down the glider. Also there isn't space for the right wheel between the VG-cleat and the downtube, so the wheel must be placed just inboard of the cleat. For maximum elegance I suppose one could move the cleat, but by running the VG string through the big hole between the hub and the wheel, the VG works just fine as is. Some wonder about the stress a wheel-landing might place on the carbon basetube, but I believe that the same landing without wheels could only be worse for the basetube.
I've heard the claim that flying without wheels provides greater incentive for perfect landings every time! That may be true, but personally I'm a firm believer in wheels, and I'm delighted to have found these.