Refine Illustrator Linework

I have a large-scale graphic illustration set up at 1:1 inside Adobe Illustrator. Right now a handful of the strokes don’t meet perfectly and the stroke weights vary from element to element.

What I need:
• Every shape’s outline must snap together cleanly—no visible gaps or overlaps when you zoom in.
• Uniform line thicknesses for each different line type so the illustration looks cohesive.
• Add textures so the lines look closer to the reference image for materiality

The document is already organized in layers and saved as a native .ai file. You can work directly in Illustrator; no need to rebuild anything from scratch—just adjust anchor points, align paths, and standardise the stroke setting. When you’re done, send back the updated Illustrator file along with a flattened PDF so I can do a quick visual check before sign-off. Real scale artwork is 24.28m long. It is a flooring print