Hi Nick

If you are still looking for a floor pan for your truck...
and would like metal...
and prefer US made ...
a reproduction that LOOKS to be right is being or has been made and you can find it here:

https://www.ebay.com/itm/203882177033

or maybe here, but at a higher price:

https://www.c2cfabrication.com/products/1939-40-chevrolet-3spd-1-2-ton-pickup-front-floor-pan

Hope that helps.