Modified corner side gussets for 10 series aluminum extrusions 1" square

I found Bill84s corner bracket and printed out a pair for my new printer but I was going to be using bolts instead of screws so where his support bracket in the back was wouldn't work for me as I couldn't get a socket in there (the irony is after all the modifications I ended up using screws) so I started modifying it, I cut the back support away but needed some sort of extra support in the corners of the brackets so I connected the tops then thought they would look better curved, then I was loo