I was really surprised nobody had done this yet, so I spent a couple hours mashing it together. Real simple install, just chuck the files into RAF manager and it should find homes for them. Exoskeleton ability texture is included but not pictured, forgot to grab a screenshot.
This does not replace his classic skin nor the model for it, it merely changes the Sandscourge skin. If you want to use it as the default, there are tutorials on the forums, otherwise buy it and support Riot.