Make sure that no identifying files get left after installation. E.g. machine-id, dhcpv6 duid, zfs identity?, hostname in weird places, etc.
Something weird is still going on with DHCP for IPv4.. might be my test setup, will need to check this in more depth.
Network configuration in initramfs currently doesn't support DHCP.
The ISO already contains some very useful tools, e.g. ipmitool which
allows to reconfigure e.g. networking for the IPMI from a running system.
Tools like fwupd or some common RAID/HBA controller tools would probably
be quite useful.
I'd like to keep the ISO lightweight, so it's hard to decide which tools to include.