Customer AS

Some of it is at I'll see about
making it better and simpler - and will add some simple configs that are
somewhat bit more idiot-proof.

And it has to be clear that if:
a) Your providers will configure their networks to only announce you if
   your line is up (+/- any damping), and
b) You believe that a load-balanced defaul route with 'ip route-cache' on
   will do good data delivery out from your network

That BGP does not need to be involved at all for the multi-homed.