There was a post on my cloth diaper sewing board asking for a tutorial on how to make this type of diaper cover. I personally have no gusset love, so I won't do many tutorials for things like this in the future. Maybe just another with only side double-gussets and a non-FOE version.
Use a long straight stitch along the very edge to baste the pieces together.
Everything basted together with a loose straight stitch around the outside edge.
Now just sew your outer FOE on like you normally would for a basic FOE cover.