I made a bit of a crude map overlay of that area, using info from the first volume of "Titanic: The Ship Magnificent."
Here:
The two biggest slips (green outlined areas with the yellow ship shapes) are, of course, where Titanic was built.
For the other colors:
Red: Mould Lofts, Plumbers Shop.
Orange: Mast Shed and joiners shop.
Yellow: Joiners Shop/Machine Shop.
Brown: Offices.
Black/White: Platers' Shed.
Pink: Platers' Shed, Smiths Shop.
Blue: Platers' Shed.
There were a few other buildings, too, and such... But this is just so you can get a picture of what used to be there.