It will be possible to configure COSMIC to look like Unity out of the box. There's only a few panel applets that need to be implemented to make the experience 1:1.
Yes, you can do anything with COSMIC's dock and panel. No extensions needed. If an applet exists on the system, you can embed it into your panel or dock.
Whoa, nice. Sounds like the best of GNOME and KDE combined, plus extra goodies like tiling. I'm not sure I can give up the AUR so I hope I can use this on Arch one day.
then install it using paru -S --rebuild cosmic-applibrary-git cosmic-bg-git cosmic-comp-git cosmic-edit-git cosmic-files-git cosmic-greeter-git cosmic-icons-git cosmic-launcher-git cosmic-notifications-git cosmic-osd-git cosmic-panel-git cosmic-randr-git cosmic-screenshot-git cosmic-session-git cosmic-settings-daemon-git cosmic-settings-git cosmic-store-git cosmic-term-git cosmic-workspaces-epoch-git xdg-desktop-portal-cosmic-git
you will also need cosmic-applets-git I need to patch mine to disable LTO=fat with LTO=thin in cargo toml so it's not part of the above command. Note I haven't done a clean build on these, but they should mostly work. if you run into any issues lemme know and I can try and fix them.
cosmic-greeter can be enabled with cosmic-greeter.service I think you need to manually install greetd im not sure I have added it to deps. using cosmic-greeter isn't necessary however.
EDIT: it is somewhat likely that I may have messed something up, but as it stands i'm currently actively using cosmic comp right now