I'm currently in the process of an 1.6TD engine in another project, very similar to the swaps they are doing in Suzuki samurais, so I've read a lot on the VW engines.
Some other options those interested may want to consider is that ACME adapters has adapters that mount a toyota trans to the VW engines. You'd likely have to use a divorced transfer case and short/length the driveshafts, but this is pretty small considering you're already doing an engine swap.
http://www.acmeadapters.com/
Also there is a guy that does a mechanical pump for the TDI engines. If you do a search on "Mechanical TDI pump" tons of links will come up. I think this would be the hot ticket for an expo vehicle. Most of the power of the 1.9LTDI, but much more simplistic. Much less of a headache than converting the wiring to run in a non-VW vehicle. If you choose to keep the engine computer controlled, it would be a very good idea to buy the complete wiring harness and maybe the dash too, that is until someone comes out with a stand alone management system.
Just some thoughts.