1) Lay out and cut the Top and Bottom fabrics and insulation for top quilt shape
2) I sewed horizontal lines in the top fabric colour and insulation to give a down quilt look. Remember this can create cold spots in cold weather. I have a -7C down quilt for winter so this is my summer quilt. You can eliminate this by using two layers of 2.5oz insulation instead of 1 layer of 5oz and just sewing the horizontal lines in 1 layer.
3) Pin the 3rd layer of fabric next to the fist keeping insulation on top.
4) Sew perimeter leaving 8”-10” open at the bottom to turn your quilt fabric sides out.
5) sew remaining open section together.
6) measure and cut material for the foot box
7) follow the same sewing steps to sew together the footbox, keeping fabrics together and insulation on top leaving an opening big enough to turn fabric sides out. I sewed in a piece of 3/4” grosgrain on the top edge of the foot box for extra support.
8) next sew in the foot box. For this I simply placed the outside fabrics (black) facing each other and sewed the perimeter of the footbox to the quilt. I added a few extra stitches along the grosgrain attachment points.
This is a summer quilt so I saw no need to add bungees to the quilt. I used ripstop nylon and 5oz APEX insulation. I live in Newfoundland so most of our summer nights are still around 15C.