Based on Krita's work. It's intended to run in Binary Factory just like Krita's AppImage https://binary-factory.kde.org/job/Krita_Nightly_Appimage_Build/
Cool, I started out to read about appimage a few times myself but never got around to really work on it. I have not tried any of that yet, but it looks very promising. Can we have that for the upcoming 5.0.2 release?
Why don't you use https://download.kde.org/stable/alkimia/7.0.2/alkimia-7.0.2.tar.xz here? This is our very own software package and we don't need to worry about it being tampered It therefore comes with a (detached) GPG signature.
Again, use our own at https://download.kde.org/stable/kdiagram/2.6.1/kdiagram-2.6.1.tar.xz