Step 1: Choose components wisely
The actions I planned for the buttons is to trigger some lights and one motor. I have chosen leds for almost all of them except for two, because I wanted the box to work with batteries. I used four C type batteries, so the box works a while with this power source.
Step 2: Mesure all components
The holes I needed to place the parts do not needed to be so precise, so I used a compass and a ruler. Otherwise I would have been purchased caliper.
Step 3: Plan where to put the parts
Step 4: Cutting holes
Step 5: The electronic circuit
I first made a prototype of the two circuit and test the speed of the flip flop flasher. I used two 2N3904 for flasher because I already have it in stock. You can easily find this circuit on the web also the gate circuit I made with two 2N2222. But it's not the essence of the whole project here, so I will cut here for this part.
After the prototype was tested well. I used a prefabricated circuit board to assemble the parts. I also place header to connect wires, so I can unplug it if I need to work on it.
Step 6: Wiring all the parts
I put the circuit board in an antistatic bag to isolate it from the unprotected buttons poles.