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I will answer the technical questions first and then the financial question .



Most building materials including bricks are subject to micro-cracking, and surface spalling due to the day night swing, and absorption of water.

To date I have some structulate panels, which have been in service for 7 years, that means 2500 day/ night cycles . ( our lowest UK temperature has been -10 our highest UK temperature would be approximately 30 C.)
There has been no signs of cracking, spalling or delamination of the surface coating..
For higher temperature regimes like Oman or Saudi, I would change the composition of the coating to increase reflection and reduce the solar pick-up . For countries like Russia -27C in winter no change required to the standard composition.

I strongly believe that for small business start ups, the human/machine interface should be kept high .and that simple relay logic works best . adding extra layers of automation is cost prohibitive to the one or two man business. With high levels of automation, you need a systems engineer just to start a pump or a blower .
Also in developing countries the law of diminishing returns kicks in very quickly where automation is concerned. For the moment old friend relay logic, next series of coating machine sand-jet No 6 .......yes definitely PLC .

Your question regarding business model is a little harder to explain, I had better do it when I am fresher in the morning.