Gun port cover

[tankbarrell]

I am currently making a gun port cover for a Windsor and have a question about the flap. Was it originally folded from a piece of 3/8" plate or were the wings welded on?

Restored carriers often seem to be the latter but I would have thought it would be folded in the same way as the main cover. I assume it is the same as a Mk2 carrier.

Any help gratefully received!