So I just finished building a cold air box.  It turned out decent enough considering I don't weld aluminum very often. 
20200818_194028 by 
Yelcamino, on Flickr
20200817_205629 by 
Yelcamino, on Flickr
20200817_195743 by 
Yelcamino, on Flickr
At the bottom of the box are five small holes.  There is another piece that will be riveted in place once the box is installed to stay.  The piece will close the gap at the bottom.
20200817_195722 by 
Yelcamino, on Flickr
Air will come in through holes in the core support just to the side of the radiator opening and also from around the headlights.  I still need to drill the holes but I'll do that before I take it to powder coat.
20200709_181512 by 
Yelcamino, on Flickr