Loisand, A few more interesting facts about the Town Hall which I found in a book dated 1866 which might interest you
Work commenced in 1832, but was not perfectly completed till 1850. It is constructed of Anglesea marble, its principal dimensions
Height of the basement. 23 feet.
Height of the columns. 36 feet.
Diameter of the columns. 3 feet 6 inches.
Height of the capitals. 4 feet.
Weight of each column. 26 tons.
Its dimensions are length, 145 feet; breadth, 65 feet height, 65 feet. It can afford comfortable sitting room for upwards of 4000 persons and double that number have often stood beneath its roof, in 1866 the decorations were of the most elegant and tasteful description. The lower part of the walls were painted grey, toned with red and yellow the upper part being enamelled in imitation of Sienna marble. The pilasters are richly gilt, strict attention being paid to classical models in their various details. The gallery fronts are in bronze and gold, and are lined with crimson cloth. The covered sides of the roof are divided into recessed panels, and are adorned with the egg and tooth moulding, and richly gilt and painted. The ceiling, gilding and painting of which is gorgeous, is divided into three compartments, each enclosing a large circle, divided into deeply-recessed radiating panels, diminishing in size towards the centre, where there is magnificent sunlight gas-burner. At the back of the Orchestra is a splendid organ, said to be unsurpassed by any in Europe. This organ, which was the property of the Governors of the General Hospital, was erected for the triennial musical festivals, which were held there for the benefit of that institution. Its weight is about 45 tons; and its trackers, if laid out in a straight line, would extend above five miles. The orchestra is further adorned with a colossal bust of Mendelssohn.
On the ground-floor there is a room similar in size to the one already described. The building contains numerous other apartments.