For this project I bought the Traffic Lights Kit and the XXL Green LED Blinker kit from Electronic Goldmine and put them in one box with one battery and a switch to switch between kits. You can also buy them from Electronic Kits By Chaney Electronics for a little bit less, but I would buy them from Electronic Goldmine even though they are a little more, they have great deals and sales from time to time.
Step 1: Plan Your Enclosure
Lay the parts onto the box where to plan on putting them.
Step 2: Measure the Hole Placement
Step 3: Mix All the Parts From Both the Kits Together (Experts Only)
But it won't be so hard as long as you know how to tell the difference between resistors color codes.
Step 4: Drill the Holes
Then place your components in the holes to make sure they fit.
Step 5: Paint the Box Gold
Step 6: Solder on the Parts
That means solder in the capacitors, resistors, IC's, and transistors
Step 7: Connect the Two Kits
Then I connected each side of the other SPDT switch to each of the kits respectively.
Then I connected the negative of the battery connector to the negative of one kit along with an additional wire in the same hole to connect to the other kits negative.
This way you turn on one switch to supply power and the other switches between kits.
Step 8: Put It in the Box
They might move around while in the box during operation so I used some thick double sided sticky tape to hold the two circuit board in place inside the box.
Also Glue the LEDs onto the box.
Step 9: Wire It Up
I used a plastic zip tie to hold the wires together.
See it in action: