A minor side-note . . .
I am also an engineer, and much of the time I deal with product safety. It would be an understatement to say I have great respect for that field.
I ran this past a NRTL (Nationally Recognized Testing Laboratory) and told them what I was up to (building toys for free distribution to the needy, in my spare time). They told me that if I wanted a formal and documented opinion it would cost a whopping lot of money. I told them that this was not work related, that it was just something I had to do, and that formal documentation was not required.
They told me first and foremost that this was not within scope of anything needing certification. I am not selling them, period and exclamation point. This does not matter; I am asking for a second opinion in product safety. This is a home project, without a penny to spend for formal documentation. I can and will proceed without their opinion, but a second opinion is good to have.
They circulated this as a pro bono project that might lift employee's spirits. I was copied on some of the chatter. There were some concerns with chemical safety, followed by replies from higher-ups to the effect that they had not studied the data, followed by email from the low-level grunts saying that the points they were debating were irrelevant; I used an undercoat that eliminated the potential problem they had debated. The muckey-mucks asked about the safety of the undercoat, and the low-level replied that it was food safe, and is an ingredient in skittles and jelly beans. Okey dokey.
Their informal and undocumented response was that yes they now believe in Santa Clause, that yes the toys are every bit as safe as I had thought, and there was no way on earth this could ever get a real safety rating. There is no way to trace the end product back to the manufacturer.
I do this under an assumed name, Chuckles the Elf.