1. Rip 1/2 inch MDF to width on a table saw (figure F).2. Create half-lap joints at the corners of the frame.
3. Construct the frame with glue and 3/4 inch wood screws.
4. Using a router, cut a rabbit joint in the MDF frame 1/4 inch deep to accept the Plexiglas.
5. Cut the Plexiglas to size using a plywood blade on the table saw.
Tip: Blades with finer teeth cut Plexiglas without cracking. Cut slow.
6. Put the Plexiglas in the rabbit cut. Hold it in place with adhesive caulking in the corners.
7. Build the face frame from salvaged molding. Cut to fit, and then miter the corners.
8. Attach molding to the MDF with finish nails in the front, and wood screws from the back.
9. Add wheels to the windows by drilling 1/2 inch holes in the frame. Countersink the holes using a spade bit. Cut 1/2 inch threaded rod to lengthlong enough for the hardware.
10. Using two nuts and two washers, tighten the threaded rod into place via the hole through the window.
11. Add the wheel to the stack, and then finish with a nylon locking nut.
12. Tighten the nylon locking nut enough to keep the wheel on the rod, but still allowing it to spin freely.
13. To finish, we added trim around the windows and aquarium rocks to create a stained-glass effect.