Nice work Pilagou!
Originally Posted by MnHPVA Guy
So I've been trying to figure out how to add the upper bars without messing up the fold.
Just a thought, but do you really need the bars? Wouldn't it be enough to have a short cross-bar at the head tube (or a rotating one at the steerer (rotating, so it won't rotate when you steer)) and a short cross-bar at the seat tube? And then either reinforce the bag, or just use some strings between the two bars for side support of the bag.
If you make the bag (and maybe side supports) removable, you could maybe add one or two sholder straps to the bag and sling it over your sholder/wear it as backpack when the bike is folded.