This is my new Raspberry Pi3 with a Mamboberry LS DAC+
I choose the steel case for the Hifiberry DAC+.
You have to make a new 12mm hole for the red plug, also you have to desolder the power plug from the mamboberry that this case will fit.
Hole of white plug should be drilled with the 12mm drill too, for better appearance.
I find that Wifi is still fine with this steel case.
Calculate a few washers/screw nuts more for correct distances.