Shy Torque,
As an ex Beagle Terrier owner I know what you mean about restricted visibility with a high wing aircraft (and the clutter of overhead metal bars in the case of Terrier!) but the position of the Cessna on Tuesday relative to me was such that I reckon he should have seen me before I was in his 2 o'clock or so. There was at least 20 secs whilst I should have been visible to him, particularly as I tried to attract his attention by manoevering
The only point I am making is that all pilots, especially in Class G VFR, should spend as much time as possible looking out and scanning. None of us is perfect but generally us glider pilots seem to be more conscious of the need, IMHO.
As a glider pilot (primarily) I don't personally rely on the ROW rule, on the simple premise that at the pearly gates it's no good saying 'I had the ROW'.