Yes the staircase was planned to have a dome even the first concepts had a different looking staircase and dome.Was the dome an original feature or was the first funnel meant to be there in the original 3 funnel design. Was it just easier to have the same dimensions as the funnel stacks? I know that the dome was a much later feature to the staircase design. The aft staircase dome is much smaller and round.
No the forward staircase dome was oval, look at the plans Iv attached. The oval shape is the same as the funnel stacks. A circle dome would not reach both the wall with honour and glory and the curvature of the well down to A deck, so it had to be slightly oval. The aft staircase dome was circular, this is because the staircase is smaller in size and could fit a smaller circular dome.Actually the forward dome was round.Some photos and early P.R illustrations have an elliptical look based on the angles they were taken.If you look at other photos,blueprints and models of the ship you can clearly see both domes were round.Besides ,what would be the logic in having one dome round and the other more oval in shape? When it came to all the basic features, these two ships were almost interchangeable,including the domes over the staircases.As for the dome being a later feature,that is improbable as the early illustrations( about 1910) done while both ships were under construction show a dome over the staircase.