Nice project! You might want to try turning the amperage up on your welding machine a little, that should improve the quality of your welds.

Thanks for your idea friend, congratulations, continue with your creativity, who knows in the future you may find someone to give you an opportunity,?, go ahead.

Yes, it’s good to spin at idle, it can still be possible to mix a dry mixture, and then all the weight will be at the base, everything will fly apart, and even more so if it is a vault. It is necessary to make two more rollers at the bottom, as guides. And the idea is very good

It’s excellent for mixing air. I’ve been looking for where to buy for a long time. And now I’ll try to do it myself.

How amazing! I've wanted something like this for a long time. Thank you friend! I'm definitely going to make my own mixer.

The electric motor remains to be installed. In general, the topic is interesting. Thanks for the creativity and video.