Here's my SB and an 11' Backwoods Daydreamer Winter Dream. Sorry about the size of the photos. I have found the 11' to be difficult at times due to space. I would think 12' would be even more difficult.
Couple things come to mind when I see those pictures. The first one is WOW! what a gorgeous place. The second is, can you imagine trying to sleep in a tent on those rocks!! Man I love my hammocks, thanks for posting those, I am jealous. I bet, between the motion of the hammocks and the sound of the water running along side you, it was tough to get up in the morning.