There is a nice easter egg on the page, it has to do with the crowbar at the bottom!

Why should they do that?

Oh for sure super useful. But when he said its open source I was ready to start building this thing. But 5k+ in total build costs is a bit steep for me.

Its cool tech but far from Consumer hands. While open source its also rather expensive to build (at least for end users). The projector costs more than 2k and the rotating platform is almost 1k. Other parts I did not check :)

If it would be 1k or so I would build one