Sign images can be changed by:

1. Replacing needed texture image in textures.zip folder (which goes with the main files) with your image and renaming it with the old image name. For example: textures\back_text.jpg;
2. Replacing texture image in the materials nodes.

Included textures.zip file contains 4 textures:

- front_text (1600 x 1094)
- back_text (1600 x 1094)
- metal texture (1600 x 1094)
- welcome_letters_background (500 x 500)