Hey Scott!
I would be happy to look into this with you.
Thank you for confirming that you followed the steps. It sounds like you did everything right.
First possible thing is that you mentioned Git already being installed. It may help to build on the latest version. You can upgrade with git update-git-for-windows.
And this thread could of help as well: Dev Environment setup on Windows 10 - Error running .build_libs.sh - #11 by Reesepuffs