It's actually 800x400 not 400x200, you can make them at 400x200 but it might be a problem getting the size of things just right. So for the guides you just place them on whatever lines are the center of your image so in the case of 800x400 it'd 200 horizontal and 400 vertical.

The gradients can be found at http://el-l-en.deviantart.com/art/6-Metallic-Gradients-for-GIMP-197304876

other gradients http://nevit.deviantart.com/art/900gradients-for-GIMP-Inkscape-103771340

Belt Template http://www.mediafire.com/download/fr23yfhuupm7ztq/championbelttemplate.rar

Higher quality video http://www.mediafire.com/download/3pn83842y7wvy74/TEW_Belt_Tutorial.rar

Questions, Comments, etc. http://www.greydogsoftware.com/forum/showthread.php?t=524968