The notches that hold the side rails are not aligned vertically in a perfect way

Missing 2 of 4 side rails, only able to make 1 of 2 folder frames

They went together easily, and the length can be customized easily by snapping off the excess length on the side rails at pre-scored intervals.

The right size and fairly easy to put together, but both of the frames ended up with the bottom of the side rail cocked in at about 45 degrees