If your going to do any kind of finish sanding make sure the body is dust free before you add the oil. Getting that dust wet turns it into a stain that will be visible on your alder or ash.
I've never had to grain-fill to get a good finish on it, but others may have different opinions.
P.S. - Don't get any padouk dust on your clothes and throw it in with the regular laundry. Turned some of my wife's clothing pink. Still hearing about it years later