Step 1: Get a Plate to Add the Seats On.
I didn't have enough blocks to make big ones, but you can.
Step 2: Add a 2 by (How Much Your Plate Width Is) on the Back
Step 3: Place the Exact Same Plate on Top of It.
Step 4: Get a Brick That Is 2 by 2 Bits Smaller Than the Other Bricks
Step 5: Place Big 2 by 2 Blocks Like So
Step 6: Do the Same, But With Another Pattern Like So