There are no off the shelf makers of full skids. You would have to custom make it. There are plenty of attachment points on the belly. You should be able to find a person who can cut and weld metal around the campas. Check Spazz and Swordies galleries to see theirs. Make sure to leave some openings for cooling and access to maintanence areas. For suppliers of materials you might want to check out some of the rock crawling boards such as Pirate4x4.com (make sure to post in the appropriate area there because they can be vicious!). There are a lot of fabbers in your area also that may be able to help locating materials.