Its nice that the raid tools are on the livecd, but they are useless without having a raidtab, so it would be nice if there was an example raidtab on the livecd - making it much easier to setup a raid. example raidtabs can be found in the raid tools package docs directory.
forwarding to the docs team - perhaps they can give some examples in the handbook?
already lots of examples available online. and since there are so many different raid configs, a preset one wouldn't really help here for general use.