That shroud is what the factory should have built, and it looks like it belongs where it is -- under-the-hood "streamlining" in the spirit of 1940.
My good friend Woody Fesler, a master craftsman, built a similar shroud of metal for my '52, mainly to hide the electric fan. It looks like a factory piece, but it ain't nearly so fancy as the one you have made.
God's Peace to you.
d
Inliner #1450