1) The black in front and the overhanging white ridge over the plants are just freeplaced shelves and debug columns
2) The skylights are made in the same way as 'roofs on half a wall' or 'drawing on facade with roofs' by lifting the roof on top of the platform on the upper floor. Here is the
video tutorial. I put the roof another floor up, so it is technically on the 4th floor, so it doesn't disappear when changing walls or other structural elements in the house. I did also add a tiny, almost invisible clear glass roof in the middle. This part provides the horizontal white divider and keeps the 'ceiling' there, so there are no issues with weather or seasons.
3) The carport is made using a tiny piece of roof with a super long eave on one side (shift + drag that eave). In order to get it to curve like that, click the roof and use shift + C to add another inflection point.
