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Consider MDO (Medium Density Overlay). It's plywood on the inside, with MDF layers on the outside, infused with waterproof resin. Magical stuff.

He's basically taking the picture facing forward, resting his hands on the radiator (which is the black thing at the bottom of the picture). The vent is into the bottom of the heater box on the dash, and the hoses on the left side are the heater hoses going into the heater box. The cab is...

Ok, yes, I have that vent (obviously). Of interest to you though, my truck has a rubber gasket around the top of that area, attached to that piece of flange with the holes in it in your picture (near that vent).

Have picture? My cab has no holes in the curved part of the bottom of the cab that I will call the "engine tunnel" (except for the 4 bolt holes for the center seat and the two bolt holes on each side for seat belts, all of which are populated).