Hee.... I bought mine sight-unseen on ebay also. You can find my inspection spreadsheet
here. (Hint: it's the file called "964 PPI Checklist.xls")
I took a couple hours to go over the car. Take a flashlight, inspection mirror, clothes or a pad for laying on the ground, and if you can work it a couple pieces of 2x12 to serve as a small ramp.
Rust at the corners of the windscreen or backlight is a big deal. One of the things I missed was a torn door where the door stay attaches (common).