Thanks for the comments Keith, YakAttaque and Russ.
Yes, that REI chair is very similar and a bit cheaper, though if you look at some of the gear reviews where both are tested the Helinox comes out on top for comfort and quality. These seats have made camp much more comfortable and they pack down to a tiny bag. So much better than the seats we used to take.
Chrisj and Slaughter use their hammocks for sleeping on board and they are very happy with them, so there are other solutions. Each to their own. I'd been looking at other stretchers but they were all very heavy, bulky and wobbly when fully assembled.The Helinox stretcher is very solid once tensioned and it is easy to slip some conduit in the sleeve alongside the pole to make a frame for supporting the tent poles:
Mate, the Bimini made a great shelter for the kitchen and didn't move in the strong winds we had some days. The dome made a big difference to comfort as well. We had some rain and it didn't bother us at all.
I'd be happy to go back to that campsite. I reckon we should organise another overnighter or two at some stage.