I’m making a solar panel frame, that I can mount on top of my camper van. I will be attaching it to an extruded aluminum rack I made on top of my van. The aluminum I am using is inch and a quarter by inch and 1/4 x 1/8 thickness. I would like to make it a rectangle, and then attach it to my 8020 rack with hinges. I need the corners to be fastened really well. #lifestyle source