As a result of my holiday work to create 10.13 installation ISOs, i got the following conclusion.
1. Traditional expanding BaseSystem.dmg and copying some packeges of InstallESD.dmg method does not work. OSInstall.mpkg missing or damaged error occurred. I have no idea to solve this problem.
2. Expanding BaseSystem.dmg only, that is online installation method works fine. But it takes extra time to download files while installation.
3. Just like method creating installation USB stick, we can use a sparse image instead of USB stick! Using createinstallmedia command method works fine and needs no extra time to download. But, createinstallmedia command demands specific environment. On 10.7, createinstallmedia command returns error code 139. I think this method is best.