I want very much to attend a build party. I own 3 AK's but don't know how to build one. If we want this to happen we need to make it worth while for the guys with the knowledge and tools, like we might want to make it profitable for them. If one, two or three guys who have the tools and knowledge teamed up to organize a build party I would gladly pay an admission fee.
And that would be considered "in the business" of manufacturing if one is making any sort of profit from the gathering, even if it's payment for time and not the act itself. To avoid that apperance of being in any sort of business without an FFL, maybe we make a picnic out of it and everyone brings noms and libations instead of money.
Camaraderie and delicious libational refreshment, and knowing others now have the skills. Payment enough.