Can't remember any more, but I used the footbox idea from a Reddit userÂ
u/craderson who built a really nice quilt. Then improvised the rest to make it into a full sleeping bag.
Cut out inner and outer shells. Then Apex insulation. Build footbox usingÂ
u/craderson's guide. Attach pocket to inner before it's too late! I think after sewing the footbox inside out and turning right way around, I didn't need to sew the rest inside out, as I closed it all using the zip and channels for shock cord (but I could be wrong). When doubling up the 2.5 + 3.6 Oz Apex, I used a little bit of fabric glue to help them stick together, but not much as they are held in place at the side hems.