Bill,
I'm just sayin that in my experience, the down won't be of a quality that will really merit the work that you will put into new items, especially those made of very thin modern materials. I'd but new down, go to a thrift store to buy used, or better yet - let one of my homeless buddies pick up a new sleeping bag or down jacket for me or free. cool

I understand people take perfectly good sleeping bags and then cut the bottom off, then lay on a ultralight pad - not for me. I've used same bag design 35 years ago and I prefer to be completely wrapped in my feathers AND to sleep on a down filled airmattress.
Jim grin
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These are my own opinions based on wisdom earned through many wrong decisions. Your mileage may vary.