I made it flat just for speed of modeling. Didnt have much time between other jobs to work on it. Plus it makes even larger. Longer print time.
@Andy87 this is genius.
As to thickness. It could be much slimmer if you made it less robust and are willing to solder the two boards together. Soldering could get you maybe 3-4mm less. Change the screen protector from 3mm to 2mm/1mm/0mm. Don’t use a bottom plate and just bolt the top enclosure directly to board.
Also its better for the first sample to be too big then too small, once I have all the parts in hand it will be easier to shrink it down. At the moment it’s just an educated guess.