Wonderful work...you've made it all your own! Does the width and height of a Class A restrict your travel options much in Europe?
Also...are those active or passive speakers with the work station...brand?
Ofcourse with the Audio/Computer studio (imac 27") we gave up half the Dinette size, but with the slide out seats you can still sit with 4 (2 without backsupport), or sit outside when the weather permits. The computer chair in the middle slides fully under the desk. I still use the aluminium pole with A smaller table so you sit and eat with 2. I use the same table on the road between the front chairs... for a quick "eat". This small table is just a Wallmart cutting board based on the existing poles and floorplate Sockets. Pictures later.
This is how I manage store items behind my TV. Used two 5/8 inch Oval Spring Tension Rods. They are adjustable 28 - 45 inch length. They have passed my test and no more stuff found all over the place. If you plan to use them, place lighter items on the top shelf. Good luck.