I've been sorely tempted by the Helinox but I've always passed since as I just can't bring myself to add half a kilo for a luxury that I've managed without so far. But now that the knees are getting a bit stiffer, I've been having a good look at close up pix of the Helinox construction, I reckon it would be very easy to replace the legs with Carbon fibre poles, but they might have to be one length rather than sections with shock cord - not too big a deal, as it could just be strapped to the outside of my pack without adding extra fittings. Getting carbon poles is easy, as is rubber/plastic bungs/caps for the ends.
I've also been toying with the idea of buying a cheapo moon chair just to get the hubs, replacing the legs with carbon, then using the seat as a pattern to do a myo cuben/mesh seat, using myo cordura cups for the corner seat supports. I would hope I could reduce the weight by at least 20-25% and still cost less than a Helinox.
Any thoughts from the hive?