Sounds like a good plan. BTW, when I had that chrome half shroud, I tried to make it into a "full" shroud by completing the circle with very thin sheetmetal. That didn't work either, I think because of lousy sealing between the shroud and radiator, and possibly the fan being too small within the shroud, so it didn't have to pull air through the radiator.

So, just in case you were tempted to try a shortcut, been there done that