This is the biggest question I have. This, to me, doesn't function as a desk because of the incline. It has the potential to be a remarkably comfortable means to use a desktop (or perhaps laptop if you built in a way to mount it), but without a way for me to sit my coffee on it, or to put a notepad somewhere and not have to worry about it sliding off.
I know you can build in mounts for that stuff, but I think there's a lot of value in how dynamic desk surface is. Need 2 notepads so you can see things side by side? Cool, put it on the desk. Working on 2 laptops today, because you got a new one? Cool, put it on the desk.
I wonder if you could find a way to to make things stay put. Anything sticky would get all over your arms. Velcro seems usable if you put the soft side on the desk, but it's ugly. You could maybe use magnets that you embed into your stuff to increase the friction enough that they don't slide. Won't help with tea, but it should work for most other things. Modern monitors and computers without magnetic hard drive are okay with magnets, right? (I can't say for sure)
