So here is a little update on the APU version: I'm having a little problem with the sizes. Either 194 x 194 mm or 210 x 210 mm. The first doesn't fit an 2,5 inch ssd neither an HD Plex 400W DC-ATX PSU but its smaller. The second one does fit both but the size is closer to the LP-GPU version (270 x 210 mm) which has space for a DC-DC PSU and an internal power brick. So I need some feedback on that.
194 x 194 mm
210 x 210 mm (the ssd will be mounted on the bottom cover)
There are two 12,5 mm cutouts on the back side, for an vandal-switch and the new HD Plex DC input jack. But im considering not to go with a vandal switch and instead to use the logo on top as the power button. By using something like this, This would free up some space on the backside that could be used for mounting the older version of the input jack.
Updates on the other version will follow the coming week and after I've sorted everything out I'll update my main post. Let me know what you think, ideas/suggestion, potential errors/flaws, any feedback is much appreciated.