Many years ago I built my own desk which was the whole length of the room using kitchen work top and cheap pine wood timber. Screwing the back to the wall and having legs at the front for extra support along its length. Worked great and looked OK too.
I probably have some pictures of it somewhere if you are interested in seeing what it looked like. At the time it had space for all my Amigas to be set up alongside each other which was great. These days iI just set one of them up when I want to use it.