Ensure that your cabinet has a nearby electrical outlet and water source. You will need to be able to tap into the water and circulate your solution, and there are several electrical components that need to be plugged in.
Cut a small hole in the back of the cabinet with a jig saw so you can run cords through it. A square hole at the base that is 2 inches square will be sufficient for the cords. Plug in a power strip and run it along the back of the cabinet. Make another hole on the other side of the cabinet to run a piece of hose. Connect the hose to the water source and run the length you need to access the interior of the cabinet. Use the male connector on the end and tighten the metal washer by turning the screw until it stops.
Cut sheets of Mylar or metal reflective sheeting to fit the walls and ceiling of the grow room. Staple them in place. This reflects the light and increases the temperature in the room.
Insert eye screws in the inside roof of the cabinet to hold the light system. Drill four holes in the roof spaced evenly to match the holes in the top of the light housing. Screw the eye screws into the holes. Put the light bulbs into the light fixture. Attach the eye hooks to the holes on top of the light housing. Insert a link on the chain to each eye hook and up to the eye screws to hang the fixture.
Run the cord for the light fixture out the outlet hole in back of the cabinet. Plug in a timer and then plug that into the power strip. Place the plans in the bottom of the cabinet and set up a hydroponic kit. This will necessitate connecting your hose to the bottom of the hydro box and installing a pump. The instructions will come with the kit.
Make one more hole in the back of the cabinet with a 4-inch router. Make it up high, approximately 3 to 4 inches from the top. Insert the fan into the hole and seal it in with silicone. Run the cord down to the power strip. Staple the cord loosely to the back of the cabinet to keep things tidy.
Install any extras you desire in your grow room. These might include a hydrometer, thermometer, misting system or any other items necessary for specialty gardens. It depends on what types of plants you will be growing, but the basic set up should be sufficient for most plants' needs.