nostr:npub15ymzglvv4alrp06q85eqqmawegxf688v0gtqwhjpgtp0a4k2mesqshkwwx has us covered on a Bitcoin logistics system so, as A to B grows, eventually that could serve as the "teamsters" and "truckers" component.
I'm sure we'll have no problem finding electrical and low voltage building automation control specialists. That's kind of Bitcoin's wheelhouse trades.
I would guess that there are a lot of home miners who are somewhat knowledgeable regarding HVAC.
I'd think that pipe fitters and plumbers would be the least represented in Bitcoin but I know for a fact that they have at least some representation.