I'd make sure your lower-boost maps are ready to go on your AP in case you run into ignition/heat issues.
I'd also pick up a few spare ignition coils, and a spare set of spark plugs. I plan on bringing a spare vanos solenoid with me in case that starts acting up. That covers all the typical crap.
The SS lines would affect the brake feel, but shouldn't affect the performance at all.
If you're getting an alignment right before the event, I'd slam them down to whatever you can tolerate negative camber wise. With NT01's, maybe 3.3-3.4 degrees negative? Given how much back & forth is at COTA, you'll probably want a tad bit of toe out in the front too.