Aarons Bike Repair in Seattle has some components assembled to make
Xtracycle/Big dummy utility load carryers work..

contact them, I suspect they have a UPS account to ship anything you need..

Like Redrilling a Rohloff hub with 16 more spoke holes, spoke groups of 6
to make it 48 hole rim compatible.. (2 cross for the regular holes, radial for the new holes)

and cutting down a screw on drag brake to 6 bolt disc adapters, to use tandem hubs,
like Shimano's in a 135 spaced configuration..