Well done. My thought thought is to fashion a vanity panel for the back to obscure the cable or device clutter if you are going to keep the desk out on the open. Something like two panels to cover the back affixed by magnets. Maybe one in each corner.

Another possibility would be to make the shelf back on a hinge affixed to the underside of the desktop so that you could access the gear on the shelf from the front. if the desk was ever positioned against a wall it would be painful to access that back area to install new gear or retrieve the odd pen that fell into the table top slot.

A very cool design to be sure