Is my Enigma inspired cipher any good?
But how secure would that be ?

Not very; there's an obvious known-plaintext-attack that recovers the key settings with effort equivalent to about $2^{28}$ encryptions; that'd be less than a minute on a single CPU core (perhaps much less, depending on the speed of the cipher implementation).
Two obvious observations:

You count the initial positions of the rotors as 'key'; however you expose them in the ciphertext (and so the attacker would know them).  The only thing initially unknown to the attacker is the rotor selections (and the initial settings used to generate the IV; the attacker doesn't care about that)

There's an obvious meet-in-the-middle attack; with a known plaintext/ciphertext pair (with known IV settings), we can scan through all $47^5$ possible selections for the first five rotors, and encrypt the plaintext through the first half the cipher with those, coming up with $2^{47}$ possible intermediate values.  Then, we can scan through all $57^5$ possible selections for the last five rotors, and decrypt the ciphertext through the last half of the cipher, coming up with $2^{47}$ possible intermediate values.  Check the two lists for a common value - that'd be the rotor settings.


BTW: if you are really interested in this 'encryption with a reduced alphabet' problem (rather than just playing around with designing your own system), you might want to read up on Format Preserving Encryption...