Now, this one wasn't originally a part of the thread, but here goes anyway. My hand-drawn sketch of the segments of the model itself such as:
the ventilators in front of the No. 1 funnel (later changed to cowl vents),
the second class entrance,
the deckhouse around the cargo hatches
the shortened A deck cutaway in line with the one on B deck
Olympic's B deck windows and
Britannic's A deck windows (before in her HMHS livery)