it's quite simple. Get the files from the model you want to make a skin for (e.g. swamptrooper), edit the .jpgs and save them under the same name, then open the .skin files and replace the last foldername in the path with the name you' ve chosen for your project. Let's say you took the swamptrooper as a base and superswamper is your project; so you would have something like that:
hips,models\players\superswamper\arms_legs.jpg. Make sure to not edit lines pointing to other models than your base...
Now, just put everything in a .pk3 (make sure you have the following folder structure: models\players\yourprojectname\).
To load the model, put the .pk3 into a new folder in your JO\GameData directory, then simply select it in the Modlist of JO.
BTW: Don't forget to edit the icon_blah.jpg's.
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"Häb Pfrässe, süsch chlepfts!" - The coolest language in the world (besides cherokee)
"Häb Pfrässe, süsch chlepfts!" - The coolest language in the world (besides Cherokee)