Hey psycherhexic ,
Thanks for the kind words. My brother in law is a cabinet maker so he made all of my furniture out of Alder laminated MDF, which helps resonances. For me my set up is future-proof only in that if I ever acquire more rack gear, he has the plans to make another side rack.
I didn't necessarily design my desk for unknown growth as much as what would accommodate my final goal. I knew what pieces I had, what I still want/needed and how many rack spaces they were etc and I designed around that.
I think in any situation you could do the same. If you see no need for rack gear then don't bother. If you could see your self with 4 spaces of rack gear in 2 years or 8 spaces in 4 years, and so on, decide now what that would take and build around the dream, but with one foot in reality. I see you already have some rack gear (looks like a powercore and presonus box maybe) so you could build a 4 space rack or a 6 space rack and get some blank panels which will look cool for now, but allow for growth.
In any situation a desk should accommodate two goals, one is sonics of the room whenever possible. In other words, proper angles of monitor speakers, placement of your video monitor, distance from the rear wall, your head and so on. The second goal should be ergonomics and work flow. Is everything in reach? Is it at the proper heights and distances for long periods of comfortable and productive sessions?
Just two cents and best of luck!