Cut the PVC pipe into 12-inch-long pieces. Sand down any rough edges. Cut one piece for each student, or cut five more than the number of students you have. This provides some extra storage space and also for changing numbers of students from year to year.
Choose a blank wall near the classroom door and lay five to eight pieces of the cut PVC pipe next to each other on the floor. Glue each piece together using a bead of liquid nails where each pipe touches the next. Clamp the pipe together with clothespins until dry.
Lay out the next row of PVC pipe on top of the first row, resting one pipe in between and on top of the pipes in the first row. Dry fit them together first, making sure your layout is the way you want it.
Take off one PVC piece at a time and add two beads of liquid nails, one just to the right and left of the bottom of the pipe, and put it back in place, pressing the pipe down on the first row. Put a clamp or clothespin at the bottom of the piece of pipe you just laid to hold in place until the liquid nails dries.
Add more pieces of PVC pipe in the same way, gluing and clamping to other pieces to hold in place until you’ve used all of the cut pieces of PVC pipe. Let dry.
Remove the clamps and slide the PVC pipe cubby structure into place. Double-check for any rough edges and sand accordingly before use.