I did a search and couldn't find any posts on exactly what I needed so here goes...

I purchased an REI Kilo Flash 35 degree down mummy sleeping bag and would like to convert it to a quilt. I feel really constricted with it zipped up. I'm thinking of taking the zipper out and removing the drawstring head covering at the top. Also adding some loops so I can strap it around my sleeping pad. It currently weighs 1 pound 3 oz so I'm hoping to get it to a pound or less.

Will this work? How is the best way to attempt this without losing too much down? This will be my first sewing project. Thanks for any advice!