I recently installed the below floating desk for a customer of mine so I thought I'd share the process at a high level and the end result which we're all pretty happy with
First challenge - it's a 2880mm desk so it was important to get the right brackets and support in place.
I got my kitchen guy to cut a length of laminate to size and I got to work on cutting channels in the underside of the desk to hide the brackets. Of course my sister hadn't returned my router and given she lives an hour away, I got to work with a chisel and a multitool. Bit of extra elbow grease required and not as clean finish as a router, but it did the job well enough.
Next it was time to measure up the walls of the study to install the angle brackets including cutting channels into the plaster on a brick wall to conceal the two large supporting brackets.
To finish it all off I pop the desk on top, screw it to the brackets, plaster/sand/paint over the wall channels and finish the edges on top with white silicone. Unfortunately don't have a photo of the desk set up yet but will do soon.
Hope you like it