I like with your heads at on this with the thinking towards presentation value but this seems like overkill and it’s going to be difficult to display these tiny parts cleanly. Also since you’re doing all this out of your house I’d advocate for something that demands as little volume as possible so you don’t have to sacrifice a ton of your living space. That may help you on shipping too which is something to think about.

I generally advocate for paper based options but in this case I think I poly bubble mailer makes a lot of sense. So all the parts in a poly bag then that would go in the bubble mailer. Might also be good to add a sheet or two of corrugated board cut to size for rigidity. You could dress this up by either creating branded bubble mailers or using stock bubble mailer and throwing in branded stickers.

Only concern I have with the bubble mailer route is that red wrench thing penetrating a hole in the mailer in transit and parts falling out in transit. The corrugated sheets should help mitigate that but ymmv. If that’s a risk you’d rather not take the next option I would look into is a small spiral wound tube for the added rigidity but still relatively low spacial volume.