I made a control panel for my freight yard. It's far from perfect, but making it any better would require starting over, and I've made so many mistakes and prototypes getting this far, I'm pretty much over the whole project! (The blank squares on the right are for possible future expansion. The top two switches control lights and sounds from two of my buildings, and I might add more things that need similar control.)
For those interested in the process, and since the main reason for this thread is to document my learnings for the benefit of other beginners, I started out trying to paint a board using very thin masking tape to mask off the lines. Despite several attempts using both MDF and plywood, it looked pretty terrible, the lines not being quite sharp enough.
Lesson learned.
Next I tried printing out the design on my color printer (having prototyped in black & white first), and laminating it. (I have a small laminator.) That worked better except I discovered that the color printer has a non-printing margin of about 1/4 inch all around, and it was shrinking down my carefully-sized diagram to fit, so instead of being 6" tall, which is the size I had cut my boards to, it turned out to be about 5.5". So then I had to trim the boards to match. Again,
lesson learned: print first, measure twice, cut once, curse three times.
Then it was a simple matter of gluing the laminated panel to the MDF and drilling the holes for the switches and LEDs. Except then I discovered that 1/4" MDF is actually thicker than 1/4" plywood, which is what I had used in my prototype, and as a result the barrels of the switches were
just too short to go through and get the nut on the barrel. Another
lesson learned. So I peeled off the laminated panel, glued it to plywood, inserted all the switches and LEDs, and tightened them up.
Finally I tested all the LEDs because when you buy a bag of cheap LEDs from China, it's a fair bet there will be some duds in the bag.