No, an important property of a secure cryptographic cipher is that it should be as close to a random permutation of the input as possible.
A "randomly assembled" cipher that just chains together different primitives without much thought is very unlikely to have that, which will mean that it will probably have "interesting" statistical properties that can be observed given enough plaintext/ciphertext pairs, and those can then be exploited in order to break it.
A "randomly assembled" cipher that just chains together different primitives without much thought is very unlikely to have that, which will mean that it will probably have "interesting" statistical properties that can be observed given enough plaintext/ciphertext pairs, and those can then be exploited in order to break it.