Lorthanoth appears to be right from what I see. I am not a DM, and honestly never want to be one. Just going from what I see, it would give him almost the same stats as the rest of us. His hit points would be around....70? Not too far off from my monks.
**edit**
Page 172 of the DM's Guide: "Add a monster's level adjustment to it's Hit Dice and class levels to get the creature's effective character level, or ECL."
Page 173 gives an example of a bugbear: 3 hit dice + 1 level adjustment +1 level of rogue= ECL of 5