Hum, I'm surprised no one has chimmed in on this one yet...  So I get to be the FIRST!
3 comments for you.  Please take these as helpful comments only, we want you to join us on the track, these may help clear things up and make it easier for you.
1 - search the forums, this topic comes up a bit
2 - Buy a GCR from SCCA (I don't remember seeing the Sebring listed anywhere in IT, I also don't remember Sebrings being available with a munual trans.... but I could be wrong about both of those)
3 - BUY a car already built.  Much easier, much quicker and ultimately cost less.
Ben