A very, very short update.
I've been ridiculously busy with work lately that I barely have time to extract enough brain juice to resume my design.
But over the weeks, I've done very small steps. A polygon here, a vector there, a slice here, a slice there.
Eventually, I was able to finish the propeller shaft, propellers and base.
I'm afraid I was not able to record the steps I went through to produce this.
But I should be able to make a write-up on those steps when I get more time.
But for now, here's the latest picture of the model:
And here's a picture of the spinner assembly:
I'll try to put provisions that would allow the spinners to rotate. :)