This eBay seller sells plans for making a frame. Looks like you can make it into a tabletop if you want. He has some of the specialized parts for sale on eBay also. Just be sure that the carriage assembly is the right size for your machine. I would email the seller first. Here is a link:
http://www.ebay.com/sch/rzsdad/m.htm...p2047675.l2562