A custom-made bag is great if you have several hundred dollars laying around. I'm just a poor slob, so I have to improvise. If you look around, you can find a bag with a good bottom to it, and besides, putting at least 2 inches of foam padding around the keyboard will be more than adequate protection. Try it! If you don't like it, you will only lose about $50.00. Then, you can use the bag and take up golf(A real expensive hobby!!)to go along with your expensive custom-made case.
Peter