Excellent to see that this stage in neally done Xion.

Just two small sugestions.
The first one, I think is a must, I feel you need to put some large flat washers between the head of the screws and the perspex.
This will help to displace the pressure on the perspex from the head of the screws and will help stop the perspex from cracking around the holes.

The second sugestion is just a superficial one, just for looks.
It's the open/non-used mounting holes in the SSD that face out to the window.
It might just be me but they are the first thing that I see and the last thing I look at when I look through the window.
If they could be either be filled with screws, plastic plugs or a strip of black tape running the full lenght of the SSD to cover both holes.
I find the devil is in the detail and this for me would just finish this off perfectly.

Looking good mate well done.