there are other sources on this page, some you would have to write:
http://history.navy.mil/faqs/faq26-1.htm
it's a USN listing of model manufacturers and plan suppliers.. the only only plans the USN and Smisthonian provide are pretty much all Civil War and before... good luck!!!
hmm I was looking on another site and the Ashland actually was laid after the Whidbey Island, it's supposed to be the same class... of course it might be a later hull than the one you saw on the other site. here's the link:
http://navysite.de/ships/lsd.htm
it took me a second to see the differences... all I remember were the Pensacola and Spiegel Grove when I was out on the Austin and later on the Guam... and they looked just like an LPD for the most part... after looking at the Whidbey Island I see the difference... although I know the Germantown did one cruise with us I dont seem to remember noticing the difference..