Mike, I'd guess that you could get the components sent separately, and save duty that way. You'd have to check the US customs tariffs. In Canada, for e.g., the frameset had a duty of 5%, but the Rohloff and the SON 28 hubs, 0%
On my Raven the wheels were the most expensive components, and I'm guessing that would be the same for your tandem.
SJSC would prefer to assemble the bike & send it to you, I'm sure, but they might understand the cost saving for you--hence a sale for them--if they were to send you a knocked-down version, to be assembled in the States. Dunno what that status might mean for your warranty?
Who makes bikes in Canada anymore except for custom frame builders?
Bill, there's deVinci, Cervélo and Marinoni in Montréal, as well as smaller not-really-custom shops like Bertrand and Eclipse across the river in Gatineau and Tall Tree Cycles here in Ottawa. I'd guess that all of those get their frames from Taiwan, though.
Dunno what might happen with the NAFTA circus -- maybe we'll get cheaper bikes & parts from Germany if the CETA is finally approved? I'd be OK with that, rather than, say, cheaper & more plentiful French cheeses.