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I don't think your height difference would be as problematic as it first sounds. I'm 6'3" with comedy long legs. My stoker is 5'7" with normal legs.
Although I hunted around a bit for a big tandem (this is 60cm ctc on the front, 58cm ctc on the back), I reckon we would have been fine on a smaller frame. We just would have needed longer seatposts and stems.
There are quite a lot of frames with big disparities between pilot and stoker out there though. This one fell into forum hands recently with @ObiWomKenobi. CP thread here.
And this one went for well cheap on Ebay to @Constable_Savage (I almost bid for it myself)
Subbed. Nice project. I'd love to get a tandem. It's the size difference that's a problem for us (6'4" vs 5'4") and the relative in-seams.