I think I struck gold, well, in terms of producing bricks that is, so let me update you on this.
So, I've been looking for a way to manufacture or get my hands on 1:12 scale bricks and ofc since this is an american building, I will use the standard US size 7⅝ × 3⅝ × 2¼ in (imperial) 194 × 92 × 57 mm (metric). I found a site that sell real brick in miniature sizes, but they are UK standard. I say but because this is the real deal or as real as it can get since they are using used bricks to manufacture the miniature scale. Now, I am tempted to go with that and and I would be very happy, however, the question is ofc.
Using English standard size 8½ × 4 × 2½ in (imperial) 215 × 102.5 × 65 mm (metric) instead of the the US size, how bad is that in terms of accuracy?
English 1:12 scale = 19 mm length x 6 mm height x 9 mm deep (according to richardstacey.com, see link bellow)
US 1:12 scale = 16.16 mm Length x 0,76 height x 0,475 mm deep (must be custom made)
Bricks
Bricks
Brickslips
Brickslips
So the option is getting real bricks, and so far, I can only locate English supplier or cast my own using gypsum and add pigment for colour. I have attached a link to a supplier, also located in England, but I am sure there are more than one. Pigment allow me to custom mix a colour and looking at the Hull building, it looks to be a dirty sienna / gault (creamy) colour with an uneven spread dark tint to some sections.
As that is not enough, if we look at the original Flynn's arcade, we can clearly see the original Hull building, while in Tron Legacy, they use a different type of brick that is brownish red in colour, which is more used in buildings aka more common. See attached image of all 3 references.
When it comes to pigmentation and colour distortion, I can pretty much use the material delivered by Dioramadebris and mix and bake as much as I like to the the desired effect. Using their pigment, I can get a dirty and distressed look besides using the sand and dirt I collected the other day (see image on page 2). I can water it down and brush it on (dry brush) as well as wet brush. I can also seal the pigment using a flat lacquer
Pigment
Powder Pigments
Here are tips and tricks from the same company
Diorama Debris Tips and Guides
When it comes to brick material, if I decide to custom make the brick, I will use a strong or hard gypsum / plaster. There are a few to select from including dentist stone, Polyblend, Merlin's Magic etc.
Merlin's Magic (a type of dental stone) including how to work with it
Hirst Arts Casting Page
Polyblend + Quikcrete acrylic concrete bonder/fortifier
Hint and tips using this material to produce scale bricks:
http://jansdollhouses.com/casting-bricks/
Amazon.com: Custom Building Prod. PBG18025 Polyblend Sanded Tile Grout: Home Improvement
Here are some more tips and tricks for making scale bricks.
Hirst Arts Casting Page
So to wrap this reply up, any thoughts on what I should do regarding the bricks. Should I get the English real 1:12 scale brick or go forth with making my own custom US 1:12 scale brick ?