Who needs plans for that particular ship? Ask an IRC guy to go take photos & measurements, or go yourself www.phillyseaport.org/olympia
Maybe a Wednesday trip at Nats... Google Maps has it at 2:45 each way. Leave early, spend a few hours, back in time for dinner.
Check your email von Tugboat, there may be something there of interest. File size feels a bit small to me so I hope they scale properly.