Uniform Texel UV Mapping

I have a finished prop model in Blender that still needs a clean UV layout. Your task is to unwrap the mesh so every island shares the same texel density and fits a final texture size of exactly 3940 × 2000 px. No stretching, no overlaps (unless an intentional mirror is clearly marked), and the islands should be packed efficiently with sensible orientation for easy texturing later.

what I want is that when I apply a grid texture all grid textures to look uniform and not stretched anywhere. I've attached a similar UV mapping result from another object and I want to achieve the same on mine. so all UV grid line should look completely straight from any perspective both screenshots attached.

Once the unwrap is done, please send back:
• An exported OBJ using those UVs
• A simple checker or grid texture to demonstrate the consistent density across the model

If you normally work in Maya or 3ds Max that’s fine—just be sure whatever you return opens flawlessly in Blender without broken links or stray transforms.

Let me know how soon you can start and roughly how long the unwrap will take; I’m ready to hand the file over right away.