Wall mounted Drop-Leaf?

[Brian Penning]

Anyone know where I can get plans or have ideas for a wall mounted drop-leaf shelf/leaf?
TIA

[Jamie Buxton]

Back in the olden days, I had a wall-mounted drafting table. Pretty straightforward -- hinges at the top, props below going back to the wall. Fold up the props, and the table drops down to hang vertical. How big are you thinking?