Rosbif
I am not going on the 747 conversion. My quals and experience are on the 757/767, so I don't need a conversion.
However, I have seen those ads for the 747 conversion. I believe they will train you but you have to pay for part of it. I don't know any other details. Did you respond to that Direct Personnel (out of DUB, Ireland) advertisement? I think it was also advertised elsewhere on various aviation job sites. I would sggest you contact these folk for the full scoop.
Good luck.