I have a 2-inch layer of foam on the HCD layout, with wire track drops running thru it to the sides (those will later be covered with a Masonite front). The wiring's insulation is good, and no bare metal can be seen on the wires. Also, no sharp metal spots are anywhere near the wiring. X-Acto knives, the Dremel, and small, sharp metal pieces are out of the way & inaccessible to the cats, dog, and nosy humans. I've learned a few lessons (some the hard way- wanna see the scars??) about hobby safety, and since the layout is in our bedroom, I make darn sure it's safe to keep. I can and should be able to take responsibility for my own personal safety and that of my family without outside inspectors, so I handle such things myself.