What do you mean by “entire” distro? The distro itself doesn’t download the “entire distro”, it’s made up of packages, like almost every distro is. You’re only installing the base system, the packages are where the rest of the downloads come from. What “parts” of the distro’s base system don’t you want? The dockers are already pretty stripped down and minimalist by default, I’m not sure what else you could cut out to still have a functioning OS?