Weapon Alpha... LPJ might have changed the 'X' into 'Alpha', but it is clear where they got the inspiration from. And you really can build your own Wolverine or Sabretooth that way, but also several other interesting concepts. Many of a Weapon Alpha's powers, however, come at a cost of ability score points, and not all of them are actually worth it (Regeneration most definitely is, but Scent? That's up to you.).
All in all, it's a very interesting and well-written advanced class, recommended for comic book fans or simply fans of the new Wolverine movie.