Greg has said there is plenty of time still, and working on one part exclusively can get demoralizing pretty quickly, this can cause mental burnout which leads to lack of energy to continue the project.
I find its better to jump between ideas and work on things as and when you get the notion. As long as you are working on something there is still progression right?
As for the points you bring up, I agree with all other than the crucible. I don’t think there should be an industrial sized one, more rather using molten metals in the mixer or another such device would make more sense for mass production of alloys.