Many of the plans have survived. Seems to be many more than on the Dreadnought project site. http://startext.net-build.de:8080/b.../index.htm
Doesn't look like the scans are available online, I'm guessing you'd have to send an archives retrieval request and hope for a scan or pay alot for a print and ship?
I think you would have to request them and they would make you copies. Still good to see that they at least exist.