I remember the days of those DIY projects! I think they're always at least 25% tougher than we think they're going to be. Thank God for YouTube though. We're looking for a new place to live now and something built after the mid-80's is a requirement because I just want everything to be standard sizes and mostly up to code.
I'm sorry to hear about the coin not being pure. They can be very tricky on social media about how they market the products. I've gotten burned a few times. It's still cool though.