Those wheels look great!
Also, please follow up and report on any FE changes. It will be intersting to see how the mass balances against the drag. Ballpark, every pound of rotating mass corresponds to about 4 pounds non-rotating mass. This is because it takes a lot of energy to not only accelerate the mass forward, but also to gain the rotational momentum. 2.7 lbs per wheel should be the equivalent of saving 43.2 lbs elsewhere in the car.
Very cool!