Here’s an easel for my neighbor. She needed it for school. She only wanted to use construction lumber to save money so it’s just screwed together. The bottom crossbar is dadoed to fit over the legs and I did route a groove in top edge to hold markers. frame is just grooved to hold the marker board and screwed together. I did counter bore for carriage bolts to provide for the pivot. It’s made to fit a 4×8 sheet of markerboard ripped in two. It spins around so you can use both sides. There’s a simple wood pin to hold it in place.