I dunno, the down in that bag is 550 power. Its been my experience that sometimes a bargain isn't such....and you end up doing more work with subpar materials yielding a 2nd rate product.
I'm not discounting your skill, but its been said that DIY isn't cheaper, but instead is potentially more rewarding. If you are serious about the art of hammocking, I'd recommend not skimping on your materials, and do it right the first time. That , or put faith and money in one of our fantastic vendors pockets.