Identified the sheet metal components that were laying loose in the bottom of the fuselage. Assembled the forward deck and the structure.
There were two deck coverings, one made of 6061-T6, and the other made of 2024 alclad. I believe the 2024 was the original piece shipped with the kit, the 6061 was constructed after the fact to try to correct some alignment issues.

I clecoed in the 2024 piece since the alloy seemed more correct. It looks good, but I'll try the 6061 piece next to see what the differences are. If the 6061 looks better, I may use it as a pattern and attempt to make a third one from 2024.