While searching the web this morning for information about a 1930s vintage German Trainer, the Klemm L-25D, I came across this site: http://www.outerzone.co.uk/index.asp
Outerzone offers FREE vintage model airplane plans downloadable in PDF format. More than three view drawings, these are complete construction plans with full size patterns for ribs and formers. You'll have to develop your own materials list and practicum, though.
They list 5,618 plans! Gonna be fun browsing around their lists.
BTW...I did find the Klemm L-25D plans I was looking for and downloaded them without a problem!