Quite cool! I wonder if it doesn't wear down the laptop hinges to keep it at 180 degrees opened in an upright position. Could print some clamps for the sides to reduce strain if that's the case. Though that'd only work for laptops that actually _do_ open 180 degrees, according to TFA, not that many.

I have a "car desk", which is just a little expandable contraption you hang on the steering wheel, then you can place your laptop on it. I wouldn't call it ergonomic per se (the right external keyboard could probably fix that), but using it for about one hour per week, it works well and doesn't cause any issues I'm aware of. The driver seat is not a place where I previously could get any work done, so the bar is a bit low.