That wasn't my intention. I'm not saying you're wrong at all, or even replying to anything you've posted. I think you've laid it out very well in fact.
The point I was making is that personally I'd avoid it because it's an area where there's active litigation going on, and the outcome of it could change what enforcement looks like in the long term. That's all.
The in-person visits I reference aren't published stories, but come from personal experience. I can't go into details, but it's happened/happening. The ATF also makes a big deal about intent. Selling a single 80% lower is fine. But when a sale includes tools, jigs, fixtures, instructions and the way BATFE looks at it gets more stupid nuanced and has lead to enforcement actions. Those are the kinds of things that people should be educated on, but would probably take pages to explain properly in a digestable way. Or at least more space than I'm willing to commit, lol.