I think that setup is over complicated. You can go without the ridge line, and without the prussic setup. Just double the cordage over from each point and tie knots along it every foot or so. Then you can fasten it to a tree just by going around it pulling tight and slipping one of the knots to be held in behind another under tension. Seconds to put it up or lower it. Or place a peg at the many points along the cord without tying anything.
Let me know if that didn't make sense and I'll do a picture
Paracord is overkill strength for this and also elastic, cordage similar to this will do fine http://www.ozsurplus.com.au/our-products/military-and-general-items/militaria/hoochie-cord/