Hi folks, was unsure where to post this so hope its going to be okay here. I have just built a wall easel that is fully adjustable and can hold several paintings at once. It is great for saving floor space and can be built to fit any available wall space. It has saved me loads compared to the cost of the three studio easels we were going to buy for my new studio. There is a post on my blog describing how we built it. Feel free to copy/adapt it. I hope that it helps some of you artists out there!
Now I've actually used it I am even more impressed. I asked the other half and he said that if you are fixing it to a plasterboard wall (if that is what you mean by drywall) you need to screw the main supports to the the main frame behind the wall. Our easel is very heavy, but on a smaller scale its quite okay to use smaller timbers.
Good luck, let me know if you come up with a solution.