"Has anyone done a write up on the conversion that you know of?"

There are a bunch of links at Tom's page, first link below:
http://volksweb.relitech.com/convert.htm
Then here:
http://volksweb.relitech.com/tdinews1.htm
.. and here:
http://cs-www.cs.yale.edu/homes/jag/vw/engine/tdiswap/bellanca.html
.. and he started a TDI mailing list on yahoo:
http://autos.groups.yahoo.com/group/TDI-conversion/archive
David of FastForward does these as well and he posts there quite a bit.

bob