Sizes... they're quite small so about 11cm x 7cm
Small is 1inch2 for me

Anyway, you showed some rendered stuff I guess, but sharp edges doesn't look great and not safe to touch or maybe this render is minimalistic because of you didn't rounded edges

In the middle those edges could be as it is but personally I do not like such sharp outside edges.
Also this corner with triangle diode will be mechanically weak and in my designs I'd like to go into transparent PCBs with part of solder mask removed to allow diode to glow througth PCB outside, but it depends what is purpose of this enclusure.
For the moment it looks like you have only fast rendered 3D model with missed details a many things to do to improove overall look and feel.
People for enclusures which will be visible inside rooms will look for some kind of art behind this and those sharp edges and rectangle box is too simple form, unless it fits in someones ferniture modern design.