How to set up the textures size correctly?

SketchUp Dynamic Components
1

How to set up the texture size correctly?
I made this simple DC, but when added the DC (txt) to set up the texture size, my Dynamic component got wrong.

I’m sharing both, the original without the txt Dc and with the txt Dc.

image
image605×597 54.5 KB

Panel_01.skp (45.6 KB)
Panel_02.skp (4.5 MB)

So what’s is the best way to put inside our DC the “texture corrector”, when I’m creating each part, or after finish my DC? jointing each part and copying and pasting inside them?