From what you've described briefly, it seems the vanes are the most difficult part to construct. Is this true? Also, this is a very critical part of the dispersion mechanism. I would certainly like to see these CNC'd. Beyond that, what else would be terribly difficult for a novice builder? What about the throat plate? Are their commercial ones available?

I would vote for "back-loading" the work. MUCH less hassle.

......Colin