Cover the glass panes inside the window with pieces of masking tape. Sand down the wood areas of the old window with fine-grit sandpaper. Remove the old paint from the window with the sandpaper and smooth out any bumps or dents in the wood.
Wipe the window off with a damp cloth and dry with a second cloth. Paint the wood window with your favorite color of paint and a paintbrush. Let the first coat completely dry and paint on a second coat. Once the layers dry, peel away the masking tape.
Flip the window upside down and attach the four mounting brackets onto the window, placing one at each corner. Screw the screws through the mounting bracket and into the wood. Use small enough screws that the metal does not poke through the other side of the window.
Sand down the four legs chosen for the project. Paint each leg with paint that matches or complements the paint for the window. Depending on the shape of the legs, you may need to paint a section of the leg, wait until the paint dries and turn it over before painting the other side.
Slide the four legs into the mounting brackets and screw the legs to the table. Turn the table upside down and press down on the window. Ensure that the table stands stable. If you feel any swaying or movement, check that you attached the screws and mounting brackets properly.