Awesome work Elliot, and much appreciated. I've just got Windows-10 ltsc working on qubes 4.1 with whonix 16. My 2 use cases are:

1. A dev machine. I have a persistent and static disposable version of this build.

2. An anon build connected to whonix. Again, I have persistent and disposable versions.

One thing I had to do was compile the QWT v4.1.65 iso and install the resulting msi. Other than that it all works flawlessly and provides great peace of mind for those occasions when I have to use Windows.