With the new release v1.1 I've added shells. Now your project can be protected from physical impact. For the updates for to the repository: https://github.com/an-dr/simpleR . 

Also, I've spent some time explaining in detail all the features of the framework. Here they are (copy-paste from the repo)

Small Range of Parts

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The framework is based on a small range of parts that can be easily combined to create a wide range of projects.

See: Base Framework Parts

Scalable

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Choose the project of the size you need, and extend it in the future.

Flexible

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Adjust the project to your needs. Add or remove platforms, choose the right volume for you components.

Easily Printable

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All parts are designed for easy 3D printing. No supports are needed.

Rigid

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The special shape of the bars makes the structure stable and rigid in all directions. The shells provide additional structural support.

Modifiable

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All parts are designed for easy modification. They are shipped in STEP format, which can be opened in any CAD software.

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Embeddable Nuts

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The nuts are accessible and reliable alternative to metal inserts than provide a strong and reusable connection between the parts.

Modular

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All the parts are made in the way so you don't have to re-print large volumes of plastic when you want to make a small change. Reprint only necessary parts.