The remains of a 7th century Anglo-Saxon ship were found at Sutton Hoo, England in 1939. It was 27m long, 4.4m beam with 40 oars and probably had a square sail.
Detailed archaeological drawings were manipulated in GIMP and used for background images in orthogonal Blender windows.
Bezier curves traced the keel and frame profiles. Curves converted to mesh, duplicated and moved orthogonally to create keel and frames’ thickness. Edge-loops were used to create rectangular meshes of keel and frames.
Currently, frames being modified, checked and re-checked.
‘The Earliest Ships’ - published by Conway
Easy read about Vikings ships for related knowledge - http://www.hurstwic.org/history/articles/manufacturing/text/norse_ships.htm
Detailed Viking ship models and methods of construction; more advanced than Anglo Saxon - http://www.hurstwic.org/history/articles/manufacturing/text/norse_ships.htm
Lots of reconstructed Viking ships - http://www.vikingtoday.com/ships/denmark/index.htm
Plank on frame ship modelling - http://www.modelshipworld.com/phpBB2/hptintro.php
Just images of Sutton Hoo ship archaeological dig; if you haven’t already tried this use Google Images to get straight at the visuals
Archaelogical drawing (probably taken from a book); had to be cleaned up in GIMP before use - http://images.google.com/imgres?imgurl=http://employees.oneonta.edu/farberas/arth/Images/109images/Insular/Sutton_hoo/ship_plan.jpg&imgrefurl=http://employees.oneonta.edu/farberas/arth/ARTH212/sutton_hoo.html&usg=__DhiX5Dqgu7do5KYYoC8QUPNR_Tc=&h=478&w=1500&sz=178&hl=en&start=71&tbnid=UPqS47P3orfSWM:&tbnh=48&tbnw=150&prev=/images%3Fq%3Dsutton%2Bhoo%2Bship%26ndsp%3D21%26hl%3Den%26sa%3DN%26start%3D63
One example of the Skuldelev ships to get ideas of construction - http://www2.rgzm.de/navis/home/..\ships\ship002\Ship002Engl.htm
Also many photos of Viking shipbuilding from Google Images