Repeat of a mail I posted in July 2011, gives some ideas of what is allowed and where to find information:
The idea was to create a campaign that gave a huge amount of freedom in the choice of model. The connection between all builds is Scapa Flow during the period that it was used as a British naval base, so in the period from 1904 until 1956.
Your build subject must have a connection with Scapa Flow in that time frame, so it anchored there, visited there, left from there, was scuttled or torpedoed there. It could also have been salvaged there.
There are no restrictions on scale.
There are a couple of reference books on the scuttling of the German fleet I can recommend:
The Bull & The Barriers: The Wrecks of Scapa Flow by Lawson Wood
ISBN 0 7524 1753 3
The Grand Scuttle: The sinking of the German Fleet at Scapa Flow in 1919 by Dan van der Vat
ISBN13 : 978 1 84341 038 6
Alec Cap put up a great link to some Youtube footage of salvage work which I found to be very inspiring:
http://youtu.be/MzuxekGZWQMAs mentioned before the campaign doesn't start until January 1st 2012.
I am considering two possibilities for a build and in both cases I will be trying my first diorama. I have the König in my stash which would make a very nice subject but I have also ordered Mirage's V-106 with PE parts. This will need converting to a destroyer that was at Scapa Flow. 

 With the small difference that it has now started 
