And remember, the Les Paul is a signature model. As is the Ibanez RG series to an extent, being derived from the Steve Vai designed Jem.
But anyway, I'd have to add, yes the Attitude does have a lot of 'unique' features, I don't pretend to say that I make use of every single one, but they are all logical. You could say it's to the Fender P, what the Ibanez, Jackson etc superstrats are to the strat. They are an evolution of a classic and proven design, made a little bit better.
Some of the features, yes, they are pure Billy (the neck dimensions, the neck joint for example). But he certainly wasn't (and he'll admit it) the first to use two pickups split in stereo, to scallop some of the frets, or to use a D Tuner. As he would say, they are all solutions to what can be to some players, common problems. I count myself as one of those who have also stumbled upon these same problems, and this bass fixes them. It is the closest I have found to being perfect for me in a stock bass.