I forgot that there is no documentation so you prolly don't know what to do with it Here's a brief explanation.

The script creates polygon planes with reference images for top, side and front views. Leave the image file name blank if you don't wish to create that plane.

It also creates a locator and adds a new attribute to it. With this attribute you can control the transparency of the planes.

The planes are also added to a new layer called REF_PLANES which is set to "reference" mode so you don't accidentally select them.

That's about it. I still need to work on the placement of the planes. For now you may wish to move them manually.