just found some AMAZING schematics online for U-570
check this link also
http://www.uboatarchive.net/U-570DesignBook.htm
its like the entire design schematic!
not to mention general plans
http://www.uboatarchive.net/U-570GeneralPlan.htm
and photographic archive
http://www.uboatarchive.net/U-570Photographs.htm
i've also just dug out a general plan for a type II as soon as i have some space to put it on i'll upload it!