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.
Step 3: Crafting
Make sure that you first measure everything well and always leave some slack. Start with one side (see photo), because all the rest is rectangular and is located between the twe sides. Start too big so that you can correct, but make sure it does not wring at the end. Once you've gotten everything good you copy the side and then it's just a matter of screwing everything in between.
Unfortunately I can not say much more than this about the building itself because each wheelchair is different. Sorry about that ...
Step 4: Attaching
Step 5: Extras
Step 6: You Are Done !
Step 7: Another Example
Step 8: Thank You !
Besides, our association is called "the sunflower petals". (http://www.zonnebloemblaadjes.be)