Another idea that might be worth mentioning @Xaitone, would be to maybe add a couple smaller pieces around the two big humps. Or maybe using something like a piece of sheet metal on top of them. Kinda add to that cab like feel - that is if you didn't want to run a body on it.
@Xaitone that looks really good and I'm not sure I'd even want to run with a body on with a roll cage like that.
I would be a little cautious for the reasons @olds97_lss pointed out, just to see how well it holds up. I don't really have any experience on the Home Depot aluminum bar.