After all the input, I have come to the conclusion that the slide out shelf is probably too risky to hold an arranger keyboard. So putting the keyboard on the main desk area, with the slide out shelf used for the computer keyboard, mouse, etc. would work, and the slide out shelf seems wide enough for a pencil and paper too. Remember paper and pencils?

However I do use a 12" laptop, (a Samsung chromebook with a 3:2 display for reading sheet music, lyrics, etc.), along with a PC monitor. Not much room for all that on this studio desk, especially if you include the actual PC, along with any external speakers.

So for me, it might be more practical just to downside my current computer desk, and leave the arranger keyboard as is, right along side the PC desk. It's just a matter of sliding left.

Thanks for all the input. I find all your setups fascinating and informative.