Rich, I appreciate the offer.
Seeing as we're looking at 88 mm spacing, and looking to do a straight shot into the port, my investigation is into motorcycle TBs that are individually made, and preferably not cast in pairs.
What I think I'm going to do is take an afternoon off and spend some time at Milwaukee Cycle -
http://milwaukeecycle.com/ . They've come through for me back when I owned bikes, and even came up with an auxiliary radiator for the Grenade. They've got yards of shelves with every type of used motorcycle part imaginable, including TBs.
What I like about the BMW setup is that all we'd have to do to get proper spacing would be to build two angle iron brackets, a fuel rail and come up with a linkage.
I'm not sure, but I'd bet they're Bosch pieces.
I'm not ruling out an off-the-shelf kit like the Jenevys, but once we know the flow demand, my thinking is that the adaptations we'd need to make it do what we need it to do are likely going to be sorted out easier with parts we can quickly access in the US through APE rather than a specialty company in Europe.