Not finalized, but hey, something to look at. Might make the drawer longer. I made it longer. One thing I forgot to do was notch out the back of the rack sides to make running cables nicer but I just remeasured my desk area and it's Probably Fine™. Drawing it on a 1:10 scale, though the 3D view is not fully to scale because I can't get it to look right without doing some perspective. Need me my 30/60 angles from drafting in tech shop to get that isometric view right :V
If you wanna build this yourself, it's not gonna be 100% accurate 'cause your 1/2" plywood is probably not actually 1/2", but the main thing is the interior width should be 19.5" and the interior height has to fit whatever rack posts you buy.
