I knew there was something cool brewing when I saw your boomstake ideas posted...great job on bringing together the idea!! I don't know if it would work for your stand the way it is arranged but if you wanted to minimize the space you take up at the campsite, you don't necissarily need to have a full 15 feet between poles...I'm currently hanging my WBBB with the stock adjustable webbing straps from a stand with about 11 feet between my hanging points at about 4 1/2 ft high, which puts my rear about 1 ft off the ground and still maintains my 30 deg. hang...just a thought, it might reduce the amount of cordage and pole length you're using just a bit. HYOH
Here's a pic of my stand to illustrate that less distance still works great...although mine is by no means portable!!
Again great job making it work!!