I also made a great 4' x 6' table with two hollow core doors and four saw horses. I love it!!!
As I seem to be mostly right brained, I am going to feel very proud that I have constructed this on my own. I don't like working with numbers (I like them in paintings!), so instead of trying to figure it out by calculation (which wasn't working . . have to have a visual), I purchased an 8', 2 x 4, put it up against the shelving, and realized from that what direction I needed to take (won't go into a long explanation!). I will post pics of the completed wall. I have decided to use cradled wood panels instead of canvas for oil painting. It's necessary for oil and cold wax and encaustic, but I'm also drawn to go back to just oil, and this way I can really attack the surface with subtractive techniques. Wow . . that word "attack" is pretty strong! :-)