Wall mount PC (ver 1.0)

Hi! I was bored one day and decided I wanted to give a new life to an old PC I have at home. I'M AN ABSOLUTE BEGINNER WHEN IT COMES TO DESIGN AND I HAVE NO EXPERIENCE WITH 3D PRINTING, but these are the parts I designed for a wall mounted project in a simple 13mm MDF board which I'll paint. Just a few holes for cable management and that's pretty much it.

(A friend of mine is kind enough to offer to print all these parts for me, as soon as they're printed I'll post photos)

Specs:
Mobo: DFI LP JR p45T2RS
PSU: Corsair 750W
Cooler: Xigmatek Dark Night
VGA / GPU: EVGA GeForce 210
3 old SATA I Hard disks

So, I basically designed a few components:

1x PSU bracket: it's mean to hold the PSU in place. Hexagonal structure was designed to make the structure strong enough but lightweight.
1x PSU cable concealer: (don't know if it's the right name). It's to supposed to hide all the cables that come out of the rear of the psu.
3x HDD bracket: These are meant to hold 1 3.5" HDD eac