Pugs are entirely different than phantoms. First off, they are of the sheridan valve train, so there will be no auto trigger. Pugs are a short barrel pistol whereas the phantom is a modifiable nelson.
I don't think the drop forward and asa are going to work unless you picked up the UMB (Universal mounting Bracket) and bought a constant air bottomline to run the tank to the pug.
Ergonomics are fine, it will be shorter than the phantom, but taller. Enjoy your purchase.