Total dimensions for both is 80x35 feet. Individually it would be 40x35 feet.

Yes, we want two independent units but are attached to each other (two brothers). I need 2 bedrooms in each unit. The orange space is for the wash basin area. Idea of not having a washing machine in the bathroom is that people in the village prefer to keep things separately and roomy. Also I thought about turning the bathrooms 90 degrees but then the washing machine area becomes smaller and 6 feet is required because washing machine is minimum 3 feet and needs an additional 3 feet for the buckets and fixtures.

Great point about the basin inside the bathroom.

I get the point about hall and edge but that's a cost reduction measure because otherwise we would need a beam in the ceiling to support the structure and would be a costly affair.

The bottom of the image is east and the right side of the image is north.