It's not built yet, but we have the materials for a glass house. Red neck style. Hubby bought a bunch of windows at a yard sale for a song. Our friend gave us some free sliding glass doors. He wants to put one of those corregated plastic roofs on. The windows and the sliding doors can be opened for ventilation. We've had plastic houses for the last 20 years. Too much work and noisy in the winter when the wind blows.

If you design it so the windows on wall and ceiling can be opened or shut like I did it will ventilate perfectly with no fan, no shading in any heat.

In my area its always hot, southern Bahamas so I am busy with a project that has evaporated cooling all the time.
Beginner as well, so it will be a trial and error thing for me.

Look at the pictures

Here is a link that might be useful: my little greenhouse

How is the project going Jorgen? Looks like a very extensive setup, I am curious to know if the greenhouse helps with our hot temperatures.