Can you buy the guide rails and accessories to convert the basic table to a multi function table?

Unfortunately, no. Festool does not offer them separately. We have a note on the product page about this, as well."Please note: The MFT/3 BASIC cannot be upgraded to a full MFT/3 for use as a cross-cut station after purchase. The hardware kit which includes the fence, hinge units and extrusions are not sold separately."