When I emailed with Mr. Goodall when the 5th came out he indicated that was it, and he was retiring from that task. I got the impression he felt it consumed too much of his time.
Along those lines... You may wish to consult the Airframes Database from time-to-time...
http://www.aerialvisuals.ca/Airframes.phpMuch of Mr. Goodall's data came from the civil registries. I now do the same with my databases and import on a weekly basis data from; FAA, Transport Canada, Austriala civil registry and New Zealand. I think you will find that where WD5 leaves off in the time line, the Airframes Database picks up. I have been tempted to "import" data on mass from WD5, but I believe there is another word for that, and it just isn't ethical. However when I research the history of an airframe I will consult WD5 and credit the source.
Oh... BTW... The weekly imports now include accidents recorded by the NTSB, plus a few other sources. I am working on importing location based data by writing scripts to crawl the web.
In short the Airframes Database is a living entity. It is updated weekly (in fact the scripts are chewing through last week's registry files as I type this), and users can contribute to documenting the history of airframes including correcting mistakes, entering text, uploading photos, etc. I would really like to see a few more regular contributors. I think the project is a decent gap filler for void left with the ending of the Warbird Directory series.
Mike