The filing fee is only $45, so applying for a copyright should be done as a matter of course whenever possible. With respect to inventions, you should be thinking about getting a patent of some kind. The options are getting a utility patent, getting a design patent or both.
Height and weight and size for a calico cat? The colour of the cat's coat does not depict its overall shape and weight. The average weight of a cat is usually about 8 - 16 pounds. Cats average about 23 - 25cm in height and 46cm in body length, not including the tail.
Drawing Scale x Suitable Text Height at 1:1 = CAD Text Height. Therefore, the standard text height in a 1:10 drawing would be 25mm OR 10 x 2.5 = 25. A 1:250 drawing would use 625 high text OR 250 x 2.5 = 625.