I've created an Orange Pi 3 model & tech drawings:
https://www.thingiverse.com/thing:4829261

Note that both the model and the tech drawings are pretty rough since all the dimensions were measured manually, but it should be enough to design a case.

Wow! Interesting project. You know, I'm also painter and now I'm looking for new technique in paintings. So if you know something like this, advise me please

This 3D model and mechanical drawing of the Orange Pi 3 provide an excellent visual representation of the device. It is both accurate and detailed, allowing readers to gain a comprehensive understanding of the device's construction and design. The drawing is also very well written, making it easily understandable to readers of any background. Overall, this 3D  real estate agent Germantown  model and mechanical drawing is an invaluable resource for anyone interested in learning more about the Orange Pi 3.