Update:

I've made a "Mark 2" of this scanner which is way more accuracy, and it has a 2 axis turntable so you can scan objects from all sides easily.   I'm really proud of it now, its on a new project page...

https://hackaday.io/project/181346-3d-scanner-mk2

And I've decided to launch it on Kickstarter, 31st August (2021): https://www.kickstarter.com/projects/jontupel/tupel3d-desktop-3d-scanner

Thank you all for showing such an interest.