Today I present you the photos of the bottom with the stripes of paper I added. The quality of photos is still low because I borrowed my camera recently and, since then, I've been using a phone to make all my photos. But still, they can give you some idea how those stripes should look like.
P.S. Few minutes ago I painted the bottom and it looks fine I think
I also have changed one of the ribs which is situated under the bow. I made a kind of compartment there which was drawn in the original part.