well, the CF hatch is a very risky mod. heres why.....
1) you cant keep the stock glass rear window- when i called VIS, they told me that the support would eventually break from the weight of the glass (but the hatch would still keep intact).
2) in turn, you have to buy lexan or Speedglass, and guess what? lexan can crack if left out in the sun too long. you can aslo forget about your rear defroster (and rear wiper i think)
3) as far as I know, there isnt a company making a rear window yet- and expect to dish out another $400 for it if they do.
I hope this helps. But I must admit, I am looking into this part myself.