This is the mod that finally got me to try out IVA and I don't think I'll ever look back. Mun orbit in my first session, and Apollo-style Mun landing next! The only thing I feel is missing from an IVA-only career playthrough is I like using the Vostok/Voskhod parts from Making History. If those were in, I think I'd spend most of my Kerbal time in this mod.
I found that you need a very specific version of MagiCore. 184.108.40.206 installed by CKAN won't work and the latest 220.127.116.11 won't work. Both cause that broken empty window. I had to use 18.104.22.168 specifically: https://github.com/linuxgurugamer/MagiCore/releases/tag/22.214.171.124