I decided to put a glass panel in the door instead of another maple panel. For this to work, I would have to make a rabbet in the door instead of a groove, but I went and glued the door together first and put off cutting the rabbet til it was ready.

I not only clamped the rails into the stiles to pull the joints together, but I also clamped the whole assembly to a flat board so that I could make sure it would not glue up with any twist.

I planed the face flat, skewing the plane across the joints.