Hardie stucco panels, Tamlyn trim question.

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I have a job that has me bidding every siding type and style available it seems. One he's contemplating is a stucco panel look from Hardie. If we did a Tamlyn metal trim, I get the process for 90%, but I cant find info on where z flashing/trim but joints. I've only seen 8' sticks from my supplier, so I would need to butt joint several sticks on a long run. Just a bead of caulk where they meet or what? Overlap didnt seem like the option with a thicker metal molding like that, so this one is ne...