Nothing yet 'done' to my Shuttle but this is the next DIY project..
I have to take regular Teams calls out and about, sometimes presenting with screenshare, especially waiting for school pickup, running off the phone as a 5g hotspot.
I wanted something a little more substantial than the two takeaway boxes wedged into the lower passenger shelf as means of supporting the laptop! (Actually a pretty good solution but not stable enough for typing)
Build will involve a couple of adjustable clamps that can support a short tray table with a raised lip to stop the laptop and mouse sliding off.
The drawing doesn't consider space for the mouse but that will be included, so it'll extend across the USB slot on the right.
The laptop will itself still perch mainly on the upper shelf, and the clamps will also have to allow for rake adjustment on the tray.
As it will just be attached for an hour or two, other options that bolt into the seat fixings aren't really practical (and it isn't a cop car

).
With the passenger seat pulled quite far forward (I have single captain seats in the front), it's not horrific ergonomically for an hour's call..
If anyone has had a go at building something like this, I'd be interested in your experiences. I did consider the various folding tables online that attach to the front seat headrest and using a rear seat instead.
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