The motherboard sits on top with the GPU on a riser mounted to the side. The power supply sits on a separate platform below.
The empty bench before I put the RGB strips on it. You can see the standoffs for the motherboard and GPU, and the hole I cut for cable routing. The acrylic is pretty scuffed up in places. Hopefully next time I use acrylic It'll be on something I can spend more time on to make it look perfect.
The standoffs for the GPU riser and the tab for the card to screw on to. It just uses a standard thumbscrew, which makes taking the card on and off super easy.
I really like the angles in the lower section, I was mostly just making this design up as I went along but I think it turned out well.
ITX Test Bench
I needed somewhere I can easily access my parts while I move them around between case builds, so I decided to try my hand at building a test bench. I made this over the course of a weekend out of 5mm acrylic and e6000 glue. It's pretty basic but I think it turned out pretty well. I learned a lot about working with acrylic here and this build has made me want to work with it again in the future on something a little better planned out and much cleaner of a final product.
EDIT: I built this before I ever started using acrylic cement (which is much cleaner than glue) and I've learned a lot since I built this, but I'm still proud of this test bench and I still love the color scheme and pictures I took of it.