As mentioned in my comment on your first question, as long as the errors were rectified from the original - rudder size, lifeboat numbers - and the designer didn't insist on skirting the iceberg belt, I wouldn't mind.
The sticking point was the lookouts being distracted - that did happen on 'T''s maiden voyage in 1912 - and when they realised they were heading for an iceberg it was already too late. For a vessel of her size, 'T' had a rudder that was much too small. The compartmentalised (egg-box) construction might have held out, had she not been torn so deeply. She might even have limped to Nova Scotia but for an un-trained and un-drilled crew that Capt Smith was lumbered with on his last voyage. But then again that was his own look-out, so to speak. They should have had lifeboat drill at least once daily, but that precaution wasn't enforced until afterward. It would have been then that Capt Smith would have realised the shortfall and reported it to the designer. If he'd had no joy from him, he should have reported it to the Merchant Marine Board by cable.
The combination of un-reported errors was what led to the disaster. Smith himself had been a long-serving member of White Star Line, and should have been consulted at the design stage.