Aux Fuse Box Panel Needs Advice...

I've completed cutting/bending the panel and fabbing the main support, however, the back edge is still a bit flimsy. Do you think it would be a good idea to use the lower bolt on the master cylinder?

Panel - 22ga steel sheet (probably should've gone 16ga on this, oh well...)
Main Support - 1/8" steel rod

Here's a wide shot showing the bolt I'd like to use...



This is the main support, utilizing a bolt in the main fuse box mount...



General shot of the panel. I still need to cut out the red circles for routing wires... or do you think I'd be better off cutting slots or smaller holes to maintain integrity?



Thanks for the help. This place is invaluable!