Metalworking newbie here. I am attempting to bend these interior flange tabs and struggling to do so. Only tooling I have on hand for bending at the moment is a press brake with 90deg V die and a hemming die. Working out some of the kinks in light gauge (24ga) steel at the moment, but eventually looking to produce this in a heavier gauge (10 or 12ga). Sides are about 500mm. Still in draft stages, just trying to work out the geometry and challenges of fabrication.

Issue I ran into yesterday when bending on the V die is that you obviously get bending on both sides of the bend line (green dash). I understand I need different tooling (or maybe a different approach entirely?) but not sure where to start. Appreciate any feedback/ideas. Thanks!