Hinged Smart Citizen Kit Case with Air Vents

I need YOUR help! I originally designed this for somebody else and we didn't get to finalize the design. I don't have a Smart Citizen kit but there are some things on this case I would like to get do away with. For example, currently there is spacer plate between the battery and the unit, I don't think is necessary(is it?). Also, I've considered doing away with the TPE grip mat that goes on the bottom and putting on mount holes.

I need feedback from people who have on of these on dimensions