[English] You can export individual parts of a model by making all other parts invisible and exporting the model. Invisible parts are not exported. Then you can import the part as a separate model. Repeat for the other other parts. Now you can compose a new model using the imported parts. For a simple model as the garden shed I would just create a new model using walls, boxes, and shapes. That way you can make it exactly like you want.
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[English] When you modify your model (double click on it) you can modify color and texture. Click the button "Modify" at the bottom left. Now you see the materials of your model, these are the parts you can separate. You can make all but one material invisible, click Ok, and you will only see that part in your 2D view. That part you can export (Menu 3D view, Export to OBJ format). It will create an .obj and .mtl file. Drag the .obj file into your 2D view and you will have a model of only that part. Do the same for the other parts of the original model and you have a set of model parts you can use to assemble a new model by resizing the parts as you want. You can further some separate parts if they have a separate group in the .obj file (g lines) but that is a lot more difficult if you are not familiar with the .obj file format. But as I stated, it is probably easier to create a new model.
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[English] The wooden parts are not created using multiple boards, that is just a texture that looks like multiple boards. Such textures are available in the Sweet Home 3D texture catalog. You can see that when you select the "Texture" button to set a new texture on a material. Using such a texture makes it easy to turn a thin wall or box into the side of a shed that looks like it is made of wooden boards.
If you really want to build using multiple wooden boards you can download and import the Dimensional Lumber Furniture Library.
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[English] For bamboo or plastic you use textures. Member iaw4 offers a download mirror to the very good ambientCG texture library . Download it and import the library through Menu, Furniture, Import textures library. For the greenhouse itself there are plenty of models you can download and then change the textures so it looks like bamboo and plastic.
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