It is 12.5 inches between the screw holes. Measured screw center to screw center.
You would need a minimum of 2 1/4" to the sink.
Read the product description/overview. The one I ordered came with two trays, one that is just open and the other has a ring holder. It also came with all the hardware. Just make sure you have enough inside clearance (sink, disposal, pipes or supports) so that when you close the tray it lays flat against the cabinet face.
Contact your local Home Depot. If they have any in stock, with the same style hinges, they can give you a photocopy
Yes you can, find decorative knobs or handles to install on fronts.
Sorry I have no idea what you are asking. What metal cup are you referring to. The entire tray comes out ( and can be cleaned) if you install them as per directions.
Rev-A-Shelf 6571-36 36 Inch Wide Sink Front Tip-Out Tray from the 6551 Series
14 and 22 inch is all I have found.
technically, it comes with 2 trays and 4 hinges, but I think you are asking if there are 2 sets, and yes there are.