The primary difference between Barbftr and Panftr is that Panftr doesn't use a code-based prey, meaning that the prey model is independent of the player file. At a simpler level, this means that Pan can be animated doing things within the enemy file as opposed to Barb, who was a cardboard cutout.

Provided as templates and examples are Grawr and ImaginaryZ's Therizinosaurus. Look to these if you're stuck or want to know how to do something.

Best of luck! Feel free to note Alsnapz on FA if you have any questions.