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1800 x 1800 will be too small. Mine is 1800 x 2700. You need the space to one end to just get in and move around. I have to be a little careful when I am working low south as the cameras only just miss the back wall. I have a 900 wide desk and seat\cabinet at the west end and it is not a warm room although I can hide under the roof slid back. No way you could add an internal wall to create a proper warm room.
I'd prefer to be about 2.4 x 3.0 meters but you make do with what you can afford and accommodate.
Insulate your roof maybe to reduce daytime heat but leave the walls. You want it to cool down as fast as possible as evening comes on.
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