The awning brackets were different on each of the railways. For example, the Newent Railway had "NR" cast into the bracket, the BNSR had a plain circle inside the normal shape. On my 4mm building, I made a jig and scratchbuilt the brackets, as you only need about 6, maybe consider that for your model.
When it comes to the awning, it's very difficult to get consistency over that number of valencing, suggest you look at what is available in etching. On mine, I used some moulded 7mm valencing which was just right for my 4mm model. Always try and think outside the box when modelling.