Autopro;
If your local metal shop doesn't have any (most don't as the stuff is so flimsy and hard to store), then order from Mcnicol's. I ordered a few 4x4 sheets and it was sent to my door within a 2 days and no duties across the border into Canada so that was even better than normal. I was very happy with the Mcnicol's service.
Also, be careful on how much coverage yo end up with on your perforated metal. The round holes tend to provide a lot less air flow so there may not be enough to properly cool the oil so be careful. The hex gives around 75-80% perforation to size so pretty good flow. Some of the round hole sets are way down in the 40-50% openings.
Car is looking great as well btw.
Cheers
Don