I built one of these using the "plans" found in the DIY forum and, while it didn't turn out exactly the same as the plans, it still turned out great. I have spent the last two nights in it and it is working great. I weigh 260lbs. My eyehooks are 6ft up, the span is 133", my suspension length is 1' 6" and my ridgeline on a skeeter beeter pro is 101".
I built it using 8 2x4s (standard 8' length) for studs. The cheap douglas fir ones.
4 - 1/2x8 zinc nuts/bolts with washer on each end.
4 - 1/2x5 zinc nuts/bolts with washer on each end.
Deck screws to hold on the legs and to hold the spacers in place.
With this configuration I can remove the two bolts for the diagonal supports and the bolt from the bottom of one of the uprights and fold it up for "easy" transport.