What are some mods and things I could change to further customize my build and desk?
You could get an oversized keyboard mat/mouse pad that has underside channels to help with hiding cables, also comes in many art, style and color variations. Add a stylish desk lamp that completes your color choices. Another variation is an IKEA LED floor lamp or two with those diffuser shades (programmable LEDs for different colors). Add a desktop headset holder (such as a wooden head "bust"). Add an IKEA artificial desk plant or shrub to give some greenery to your scene. If your case has enough interior space you can add in some Funk-O Pops of your fave movie or game character. Stick some adhesive LED strips behind your monitor or rear edges of you desk for extra mood lighting. Many people use an Ikea countertop as a desk with IKEA storage drawers as legs to hold it up (you can go even further by adding 8 - four per side - adjustable tabletop risers to those drawers to give your countertop desk that "floating" illusion. Mount power bars underneath your desk and use zip ties or electical tape to keep cables neatly bundled, hidden and off of the floor. You'd be amazed at how clean your set-up will look!