Happy to help You.

1.
Forget it.

2.
Calibrate Your expectations.

3.
Why are there no good videos of them using ISO30 spindles and machining steel ?

--
I scratch built a machine like that.
It took 17.000 hours and about 100k€.
..

Because I was well known ..

I got employed by the best and biggest machine tool maker in the world, HAAS automation, as their general manager for sales. Spain.
I grew sales from 4 / yr to 65 / yr in 8 months.
.. removed longish detail ..