Want to build sGSI for Mi Fold1 but readme is confusing

[LeOS-GSI]

I have unpacked my super.img from MiUi13. Now I have a folder 'super' which includes the images from super.img.
you are writing:
... then drop the unpacked img into the tool directory and run . /SGSI.sh
but there is no tool directory, only a tool_bin
when I'm putting thesystem_a.ing in that folder and run ./SGSI.sh AB I'm getting this error:
`ich@leos:/media/ich/exSSD2/SGSI/SGSI-build-tool-12$ ./SGSI.sh ab MIUI
Usage:
./SGSI.sh [Other args]
Build Type: [--AB|--ab] or [-A|-a|--a-only]
OS Type: Rom OS type to build

Other args:
[--fix-bug]: Fix bugs in ROM`

when I try repacking with ./makesuper.sh I'm getting this error:
super.img 不为 raw image image 格式检查失败 super_new.img 创建失败

Do you have any chat channel like Telegram or Matrix to discus the issues ?

Hint: I'm the creator of LeOS-GSI (https://leos-gsi.de) and I hope, I can integrate my LeOS system.img in the super.img with your tools.