I got some sweet Cadillac logo valve stem caps off amazon!
Edit: Now that i laughed, you have it covered. I think someone came out with springs recently. Other than that, there really isn't anything past the JB4. If i was sure it wouldn't give me problems i'd have one, but i don't need the power more than worrying about if it will start misfiring on me when i pull out to pass someone on a country road.
I saw that tapout was considering a version of their CF lid for the 3.0 but that was a while ago and nothing since. I looked at the PNs of the stock stuff and the CT4VBW intake box / outlets / MAF (IIRC) are different PNs, as well as the ducting to the turbos themselves. There's probably a way to make it work, but at what cost. A drop in lid with real gains would be nice, even at the CT4VBW price.