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Add a 1 x 1-1/2-inch piece of wood called a nailer along the top edge of the cabinets. This will serve as your nailing strip so you don't crack your cabinets. Measure the length of each run of the nailer.
Using a miter saw, set at a 45-degree angle, cut pieces of baseboard-type molding to create a riser, which will serve as the crown molding base. Measure different angles to create custom-angled cabinets.
Apply wood glue to the riser and attach it to the nailer with a pneumatic nailing gun loaded with 1-1/2-inch nails. The riser should reach to the ceiling.
With the miter saw still set at a 45-degree angle, cut the crown molding to length. Cut it a little heavy leaving the pencil mark on the molding. You can trim down if necessary.