Traffic Light

Originally I made the circuit board for this circuit that was alternate between 3 lights. In doing so I thought it would be neat to model, print, and paint a housing in the form of a traffic light. 2.5mm LEDs fit in top of the traffic light with the wires heading down to the circuit board. The switch is wired in line with the battery as well as a fourth white LED shining over the circuit board, the two small holes on the left wall of the circuit board inset are where the leads to that LED stick through. Sadly I don't have the original circuit I referenced in Highschool but here is a link to a circuit I found online, Link (I believe it to be the same). Feel free to modify but please don't reupload the original. Thank you!