Bench Power supply

Hi All, I am a newbie for fusion 360 and 3D printers. So this is my very first attempt toward any pro design. This is a simple box/case for a bench power supply.

there are five things in total and

1. Front
2. Back
3. Top
4. Bottom
5. middle (i.e. for 300W dc-to-dc buck convertor, and 12v for full-size fan)