To solve this problem, I went looking for a solution. We had a lot of old wheelchairs that were no longer used, so converting one to a mobile workstation seemed ideal.
Have fun reading the tutorial or with the construction of your own first aid for damaged wheelchairs
Step 1: Find a suitable wheelchair
Step 2: The design
In my last step I show another example. On that one for example, it wasn't possible to make a tray on the bottom because there were two cross beams.