As a tip, catwalks are every builder's dream. They allow you to build curves easily. It is kind of hard to explain in a KZbin comment, so I recommend you search how to do curves with catwalks. Basically, you go to a foundation and add a catwalk (with no railings) on the side of it. Then, while aiming at the catwalk, hold ctrl to rotate it 1 degree and then build another catwalk. Keep going like that until you feel satisfied with the curve, then you can build foundations all alongside the inner side of the catwalk, allowing you to build curves with ease. Remember, you can get catwalks on the awesome shop.