Yes I have, and the Door strikers themselves are being cnc jet cut out of 7075 as we speak in Detroit. These strikers and their backing plates do not weigh much though. 3 lbs all together in stock form, so Alu's would only cut off 1 to 1-1/2 pounds at the most.
Where the holy grail is are the door hinges themselves. Mine were sold to me before they even made it to market and now they're asking like $700.00 a pair. They save as much as 8 lbs between two doors.

All of these confessions that have pawed out about the car was only because the CIA made me do it? Freedom of information act I guess. LOL.