This is the picture taken from the Guildhall.

And this is my modelling of the room and the arc, matching the place it should be positioned.

Researching the room from taken pictures, I found that there is an old stove made from bricks.

It is coloured in white, but according to what I know about Great Britain, in old times all the bricks were red.

The link for the bricks material:

http://www.ehow.co.uk/how_5329294_clean-red-brick-deck.html

So, I made the stove from two boxes as it is shown on the picture below.