Steve,
I have not ridden on a set of the 24 spoke wheels, a friend of mine has them on his tandem. So far so good. First what is your team weight? and add any thing your going to carry along with you. I build all my tandem wheel as 48/3X but all my tandems are used for loaded touring or off road.
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Bentbaggerlen
"When the spirits are low, when the day appears dark, when work becomes monotonous, when hope hardly seems worth having, just mount a bicycle and go out for a spin down the road, without thought on anything but the ride you are taking." - Arthur Conan Doyle