This is prototype #7. I weigh ~165 and am suspended by 2 lone spikes. The angles to the spikes on the lines are FAR from optimal - if I spaced them farther from the uprights it would have been even stronger. Currently all aluminum design except the steel cable. Likely to use Stainless in the finished product and perhaps stainless cap on the aluminum bar to prevent mushrooming.
I haven't weighed it yet - I won't bother until I'm really happy with everything (probably another 10 revs or so