Mobile Home Porch Roof

Here is the challenge –
1. determine the maker of the corrugated roof so I can ask them about strength.
2. give me your opinion about putting a 4 by 8 foot 1/2 inch plywood panel on it to support me as I work to seal the gap.

Nice yellow stars might be a clue about the maker.

The challenge is to clean this debris and properly seal the slanted metal to the bottom metal.