Certainly not 6061 and 7075 series in T6. I've worked with those. Of course your bend radii is based on the thickness and type of aluminium. Well you might use what is commercially available, but what GiVi had for the R1150 GS Adventure didn't catch my eye, so I made my own. I thought about using 6061 aluminium, but then I'd have to either powder coat it or clear anodize it, so I went with stainless steel (downside: weight) and glass beaded it to give it a finish near to the paint on my GS. Here is my BMW R1150 GS Adventure GiVi Custom Topcase Mount... Yes, the GiVi could have been mounted further forward if I removed the grab rail, but I wanted to maintain it for the times I move the GS about while parking it. More of my stuff for the R1150 GS Adventure...nothing that is rocket science, but if if someone can use the ideas, why reinvent the wheel.