Sounds like you got alot done in a short amount of time.
We used the Summit headers also. Can't beat the price for a coated header, but It's the same old thing, you get what you pay for. We are still in the build phase with our car so we haven't ran them enough to see what they'll do over time.
You can't really see in the above pic, but I had to dimple the tube that's close to the steering box. They're supposed to clear power steering, but you know how that stuff goes.
The only other complaint I have is how low the drivers side is. I'm pretty sure when we get this thing on the road my daughter will scrape it on a speed bump or two. I guess if she screws them up to bad we'll try some better fitting ones next time.
Here's a pic of the difference between left and right....