I was wondering if there happens to be a write up or even if its possible to install subs and amp and wire it to the stock radio unit?

Go to PAC audio they make some great line out boxes for OEM systems I have one in my WJ and it works great.






It plugs in inline between the head unit and the main wiring

_________________
With enough fabbing, time & $, it's certainly possible.
That being said, it's like boinkin' your sister...just because you can, doesn't mean you should.