Thanks to Mike White who created this video guide: http://xcartguru.com/tutorials/x-cart-5-tutorials/building-a-custom-skin-in-x-cart-5/

Topics Covered

Creating the Theme/Module folder - https://www.youtube.com/watch?v=3zV1ZmHaUWY&t=1m4s Creating Main.php - https://www.youtube.com/watch?v=3zV1ZmHaUWY&t=2m45s Creating Skin Directory - https://www.youtube.com/watch?v=3zV1ZmHaUWY&t=5m45s Activating the Skin Module - https://www.youtube.com/watch?v=3zV1ZmHaUWY&t=7m45s Creating style.css - https://www.youtube.com/watch?v=3zV1ZmHaUWY&t=10m32s Creating Viewer Class - https://www.youtube.com/watch?v=3zV1ZmHaUWY&t=12m12s Editing the CSS - https://www.youtube.com/watch?v=3zV1ZmHaUWY&t=15m00s Using Webmaster Kit - https://www.youtube.com/watch?v=3zV1ZmHaUWY&t=15m42s Overriding a Default Template - https://www.youtube.com/watch?v=3zV1ZmHaUWY&t=16m37s