I knocked out a few more small items yesterday:
Cleaned up (with a grinder) the cuts to make sure I didn't have any obvious sharp edges.
Spray-bombed the cut areas with rust inhibitor / paint.
Took the dash bar out and cut off a couple of brackets where the stock dashboard mounted to. Without the dashboard, they turned into knee-spears, which was always awesome as you were getting ready for an autocross run.
I cleaned those cuts up as well and smoothed them down, then gave the whole thing a couple fresh coats of rust inhibitor / paint, mostly to clean up a few spots where bolt heads had rubbed the paint away.
Today I'll be trying to figure out where this massive clunk the car has developed at the rear is coming from. Something is loose, I just have no idea what. While it's on the ground on wheel dollies (so I can move it around) I'll probably check / correct (if necessary) the alignment.