We borrow rpm packages from fedora 41, because we won't build all components ourselves. Download all packages using wget !
$ wget -ci packages.txt
for the alternative, we can use a script.
$ bash packages_downloader.sh
After all packages are downloaded, we can extract it usng rpm and cpio.
$ for rpm in *.rpm; do rpm2cpio $rpm | cpio -idm; done
After we extract all packages, we will get usr and etc directory. We can copy all files under usr and etc to /usr and /etc.
$ sudo cp -r usr/* /usr/
$ sudo cp -r etc/* /etc/
Now launch Cosmic desktop with your prefered display manager, I use tbsm personally and it works great.

keren banget min