The fuel tanks were obviously made by an outside entity which also has no quality control concepts.
The curvature of the tank top does not match the wing ribs, the outlet positions don't align with the holes in the No.12 wing rib and the goops of set tank sealant around the rivets and filler cap will take a lot of cleanup work.
It is also noted that none of the fasteners required to install the fuel tanks onto the wing spars have been supplied as part of the "Kit".
Gap between fuel tank skin & top of rib 12 at wing root end
Mis-alignment of hole in rib 12 & the fuel tank rear outlet
