Hypothetically, if cost is not a major issue, and my calculated usage is x kW, with double the required roof space available for panels (excluding the house roof), can you see any reasons not to utilize all available roof space for panel installation? This setup would exceed the calculated kW by about 100% and store the excess solar power in a bank of batteries.
I also want to mention that my dwelling is far less sophisticated than your "economy house". Therefore, I might be able to adopt a simpler approach but without cutting corners.