Geez, self-promoting is what this sub-forum is all about!
I am concerned that your box doesn't show standoffs. With bare pin terminals on the bottom of Arduino and metal casing, you would short the board if you try to screw it directly to the case. Also, how many of your 4-40 screw can actually be tightened to the board without hitting components that are placed too close to the holes? Maybe two out of four? Not your fault if this happens.