Texture Blending Issue

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First, your .Blend file does not include textures because the textures are on your computer and not mine. To fix this issue, you can pack textures in with your .Blend file.



Second, I was able to fix the issue using the "merge vertices" method I mentioned previously.

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Here is how I did it.

First, you have to combine the model parts together. You said the UVs got messed up when combining the model parts together. This is because the UV maps for each model part are named differently. All you have to do is rename each model's UV map to the same thing and you will be able to combine them without the UVs messing up.



The model should now look like this.



2nd, you have have to combine the split vertices together. To do that, go into edit mode and press "3" on the numpad to switch to the side view. Toggle "X-Ray" so you can select through the model. Select the front of the face then press "M" [for "merge"] and select "By Distance". This connect all of the separated vertices and fix the shading issues.

....you are the absolute best. youve taught me so much in just these short responses thank you so much!!!