Have you thought of pulling the tin off and replacing with blue board and rendering it. You will be paying atleast half of what it would cost to do bricks and save a lot of time.
Eg it will take 1 day to put blue board on and 1-2 days to render it and doesn't need to be painted as you can put the colour in it.
Brickwork requires more work like digging out ground to lay foundations for the drop edge beam for the bricks to be layed on 1 day, form work and laying foundation 1 day, strip form work and let it cure 3-5 days, lay bricks 2-3 days, and finally the brick cleaner 1 day.