After forking and building myself, I assume these lines have something to do with it?

cp: cannot stat 'partitions/*': No such file or directory
System image: Applying update: halium_halium_arm64.tar.xz
cp: cannot stat 'partitions/*': No such file or directory
System image: Applying update: device_sargo.tar.xz
System image: Applying update: version.tar.xz
cp: cannot stat 'partitions/*': No such file or directory
losetup: /dev/loop0: detach failed: No such device or address

Can these be fixed by tinkering with the build script or the kernel?

I'm willing to help test. I have Verizon, live in the USA, and have VoLTE working on the latest version of LineageOS for MicroG. How can I help?

Also, can I get some elaboration on the super partition problem? It doesn't seem to be an issue for Postmarketos on a mainline kernel.