Android version custom

[nam23]

Hi! sorry if it s the wrong section.
I wanted to know if it is possible to connect the android version to outside devices? I ask because I would like(no promises) to 3d print some sort of psp-like phone case with real buttons connected to the phone(through the usb port), replacing the tactile command. I know multiple DIY retro consoles have been made but they all seem to use a rasbery pi/other cheap electronic cards, and i don't think it really compares to the horsepower of a phone