I found a link to the intelligence reports called "the mission to Japan"
where the americans assessed the japanese technology.
original posting (i.e. where I got it from) is www.betasom.it

it contains large volumes about japanese ships, subs, guns,
torpedo's, landing craft etc.

I'm quite pleased with this find. hope you are too.
this is the table of contents :
http://www.fischer-tropsch.org/primary_documents/gvt_reports/USNAVY/USNTMJ%20Reports/USNTMJ_toc.htm

Nice find, Ron, thanks for sharing mate!
~Gunny

"Data Relative to Life in the Jungle and on Sea Islands and Data Composition of Insecticides"
and
"Dentistry in the Japanese Armed Forces "
i just loved!!
serious thanks for sharing, there are some really brillant stuff there to superdetail torpedoes -and I still have the kaiten to check!

Very interesting. Thanks for sharing.

Gator

the one about landing craft contains complete building plans !