For the gazebo roof you can use the Roof Generator plugin. Draw a room in the shape of the roof as if you are looking at it top down. Use it to generate the roof.
You can use the Generate 3D Shape plugin to create shapes with up to 8 points (a cube). Of course you can create multiple shapes that way and combine them if you need more points.
As an alternative to the Roof Generator you could use it for the gazebo roof since it's a simple trapezoid form with 8 points. Note the corner points using the existing roofs for both the underside (ceiling) points and the top (roof) points. If you use the coordinates from your existing plan and use the correct elevation value (Z) then the generated shape will appear in the exact place where it should be
ETA: the correct url for your image: https://www.mediafire.com/view/fmza3o9xb9krsly/casa%202.png23.png#
But remove the space ("%20") between "casa" and "2.png" or replace it with an underscore if you want to use the url as an image here. If you can avoid it then don't use spaces in names.
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