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You somehow need to find a lot of space between the rear tyre and stoker's right pedal. Straight-through drive is a good idea for the sake of both the frame and the rear BB spindle and bearings, but something has to give. I managed to squeeze a 10-speed sync chain past a fat track final drive chain on mine with some 2mm thick chainring spacers. Some touring tandems use cranks with much wider Q-factor allowing a straight through drive with the timing rings outside the final drive rings. Paketa have given themselves a tough job trying to squeeze a wide belt and two final drive rings inside a conventional road crank Q-factor, which is why they have had to resort to their special yoke.