Sorry I haven't responded earlier. Between an illness and losing my internet access for several days, it took me longer to respond than it should have.
Anyway, I've spoken to my co-worker's husband. He's interested, and he implied that his son is, too. The drive to Winchester doesn't bother him. He did say he won't be free until April, though, since they're in the process of moving.
And rafmeister, Ashburn is about half-way between Herndon and Leesburg, maybe slightly closer to Leesburg. 267 passes pretty close to where I live, and 7 passes us a bit to the north.