Just to chip in on the rear brake conundrum, from what I gather the drum/disc brake is only really useful when heavily loaded on long descents. Rim brakes will have enough power to stop a loaded tandem (different story if it's wet but that's the same for any bike), but if you use them too much the rim can overheat and burst the inner tube. A hub brake doesn't have this problem.
I know of a couple touring from NZ to London, loaded with shitloads of stuff including a trailer, they didn't have a disc on the rear and their inner tube exploded on a descent at high speed. Not nice. The frame builder at Longstaff was in the room too and he was not impressed.
Just to chip in on the rear brake conundrum, from what I gather the drum/disc brake is only really useful when heavily loaded on long descents. Rim brakes will have enough power to stop a loaded tandem (different story if it's wet but that's the same for any bike), but if you use them too much the rim can overheat and burst the inner tube. A hub brake doesn't have this problem.
I know of a couple touring from NZ to London, loaded with shitloads of stuff including a trailer, they didn't have a disc on the rear and their inner tube exploded on a descent at high speed. Not nice. The frame builder at Longstaff was in the room too and he was not impressed.