I was going to suggest that tach adapter as well.
I built my own aluminum sled tins for my Spyder, but they run the other way from rear engine guys, dumping the air towards the trans. My J-tubes run directly under the cylinders, so a hole in the front of the tin was needed. I modified a couple valve cover bails to fix the head edge, and made a couple tabs to attach to the case. Dropped my oil and cylinder head temps by 10 degrees F. The curved aluminum tucks in tightly behind the fiberglass 911 shroud.