It's a straightforward bit of kit. My ceiling protected magic mirror is coming along well.
I did have a few moments though, mainly with worrying about exactly which orientation I should use when soldering the zero w on. I checked and double checked, because unsoldering dozens of connections wouldn't have been easy!
One thing to note. Once soldered in you have NO access to the usb, so attach your monitor and keyboard and get your zero W setup for SSH before soldering.
The piprojector code on GitHub could be a bit more robust, I'll try to put together a more complete flavour (auto detecting resolution being the main one)