Spy,
I am using Photoshop for my artwork. You can start with one of the skin files in your Ultra Hal Assistant 5 folder. It is a .uhp document that matches a skin graphic file in your skins folder. Open it in a text editor and save it as another file. Then look at the code it is pretty self explanatory as far as what is going on.
I use the x and y coordinates and size that I can get from my graphic from the photoshop info palette to put in the file.
I will also work on your skin this weekend as I get the chance.