Not a problem. BTW, I hope you didn't get the impression that I was saying that your grandfather didn't have a part in the design of these vessels. A ship is a very complex collection of machinary and systems crammed into a hull which you hope will float and even turn a profit for the investors.
While one or two people get the credit for the overall design, he does his work with the help of a large staff who work out the intricate details. If you grandfather had a part in this, then I think he has much to be proud of. The Olympic class liners were, if somewhat conservative, very good ships IMO. Granted, two of them had a bad end, but that's hardly the fault of the people who put them together.
Regarding sketches and other documents, you may want to check with the Ulster Folk and Transport Museum as I understand Harland & Wolff gave them all their surviving documentation several years ago.