Really nice write up and an excellent area, I've walk the Rhinogs three times always camped at Talsarnau and left the car there. Then walked up through Bryn Bwbach and onto Moel Ysgyfarnogod and followed the main ridge down to wild camp by Llyn Hywel. The next day walking to Barmouth for a pint in the pub with the painting of H.W.H. Tilman on the wall. The first time I did it we hitched back for the car, not recommended. The second we were a large group and so had positioned cars at each end. The last time we hid bike in the wood behind the layby where the path starts/ends (grid 623157) that was the best trip.