Large floating desk - seems plausible?

One other thought - you don't want the desk to be too thick. For the best ergonomics, you want the vertical distance between your hands and your thighs - i.e. the thickness of the keyboard, plus the desk, plus a small gap - to be quite small. Image search for "desk ergonomics" for diagrams. Related to that, pay attention to the height of the desk from the ground. You want your feet to be flat on the ground.
 
I have a 4m wide, 60cm deep floating desk.
Recessed into three walls.
I used sold oak slat kitchen worktop.

I did not want any legs so I could move chair to any point along its length.

I screwed 25mm x 38mm wood on all three walls to drop desk onto. I used this dimension so I could screw into wall and up into desk.

I then put three of these, one every 1m along back wall. Note that you need notches in above wood.

To stop sag, I was going to put a 4m length of 25mm angle iron, acrewed every 40cm onto the underside (stepped in by say 15cm). But in the end i did not need it.

I finished it off with a few cable holes big enough to take plugs, filled with the plastic slots, and a cable tray suspended underneath along the back. (The cable tray was a lot more expensive than I expected).

I can happily stand on it.

Sorry I have no photos.

Sfk
 
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The upstands could be screwed through, with gripfill or similar.

I used the square tube because we used it everywhere. I suppose that it might(?) deflect less?

I’d use whatever you have available, or easier for you.
 

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