I am needing to remove my steering column from my 1980 911SC, and I've started disassembling the ventilation box (air handler), so I can access the steering column.
However, after getting the fan out of the way, it is looking to me like I'm going to have to drill some rivets out in order to remove the box. But I can't tell for sure, and don't want to indiscriminately plow into the job.
I need some instructions!

I have searched Pelican's forums, as well as the internet, and don't find any step-by-step instructions on removing the air handler.
I would sure appreciate it if someone could direct me to an appropriate post, or could post instructions here.
Thanks!