It doesn't really matter what other cabs use. What matters is what is comfortable for you. If you are buying an existing cab to convert, you might want to check it's height to see if it works. However, if you are building one from scratch, you might want to mock something up to physically try the screen and CP heights. If you have access to an arcade with a variety of cabs, you could always give them a play to see what works, but you need to give your dimensions a try to make sure they are correct.