WOAAAAAH!! thats a small model - looks fantastic.
I agree with your assumptions however, I'd like to be sure. The research I have done so far indicates she had a 'large' hedgehog (Mk 15?). Also that some G and H class destroyers had the B mount replaced with a hedgehog projector. But, all the pictures of OTTAWA show her with all four turrets. If I was adding a Mk 15, I would add it directly aft of B mount. But I'd like to be sure. I guess I'll have to make a trip to the Naval Museum at NADEN an see what info they have (hopefully the have a model).
Cheers and thanks for the input
I'll post pix of my progress in a seperate thread later today . . .