How I can make R15 look like R6?

What I mean is I want to remove this outlines:
And make it look like R6 without outlines / Smoothed Edges.

How I can do that without need reweld everything and use common parts?

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You could maybe use meshes, I am not sure but I used meshes to correct edges and make it look like R6

I tried to use meshes but it just got a blank texture and even if I change to other color still blank.

It inst, is literally R15 Model or something like that.