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For the block it makes more sense to block the top. That way air hitting the block will transition smoothly to the top of the hood. If you block the bottom, the air will go up and hit the unblocked part and spill back out, like a parachute. A higher mounted block could also act as a ram I think, pushing air into the radiator.
I want to get a similar full belly pan made for my XJ. The normal material they use for skids is 3/16" steel, which is really heavy. I'm thinking 1/8" with dimple die holes for rigidity, covered underneath with HDPE, would be strong and light, allowing you to have a huge aerodynamic belly pan/skid. For all I know 1/16" could even be strong enough.
Aluminum might also work
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