I made my own with a drill press and circle cutter for my dewalt 611. I used the standard base by removing its plexi part and using the screw pattern to mount it to the plate.
I used this
http://www.amazon.com/gp/product/B000H5MYIY?psc=1&redirect=true&ref_=oh_aui_search_detailpage
I did this before getting the x-carve however