Hi Kevv thank you for sharing your Design, i liked it and went ahead to try it out for myself. I changed the Infill to Gyroid as i like the astetic a bit more and used PETG Prusament Matte Black. I have some suggestions and observations, but please take them for what its worth to you. Here we goo ;) Mainboard Standoff: I would change the Mainboard stands to also have a face blend just like the Fan assemly for more structural integrity one brocke of on mine (again i used gyroids your milage may be different) General Assemely Markers: I found it quite unintuitive to assemle maybe some markers what side on what and in the Printfile more Descriptions i attach a Printprofile with some ideas. Top Slot: I have no idea why you went with that ;) it makes it more prone to not fit a part and adds no value. I just pried id off and everything fit quite well. I broke of one slot because i tried to fix it with this ledge. Slot i think you could probably make it more ridged and a better slot system if you would use push slide slots. And ore face blend them aswell. With slide slots you can push from themore ridged side of the part along the fully printed edge insted of the whole part.

In comments my suggestions for improvements but i like the design idea;)

Is there a piece missing for the bottom? I only see 5 parts when opening the file.

Awesome design, thank you! I think the back plate should have a hole for the power brick connector. Mine has an 8mm diameter but I think they're pretty standard. How do you plug yours in?

Very cool. I have a mini ITX board laying around too. I should try this.

I printer the entire case and I like to. It is a bit tight to put together so I recommend adding brim around it so it doesn’t warp as much. Cool model tho

Gyroid comes with a lack of rigidity drawback. One of the standoffs of the motherboard broke off while screwing it in unfortunately. I think the model needs to be redesigned for this infill type (add strength in some areas).