HOLY CARP! You made the louvers, too? I thought you inserted a pre-made vent panel!
Hot Rod Charlie has a machine for pressing out louvers and I've watched him use it (on steel and larger louvers than you made) - it is a very precise, very time consuming process, even with a machine that lines up on one or two axis. Yours look pretty good so my hat is, once again, off to your efforts and accuracy.
Wow!