You can map classes which have no 1:1 representation in the database, it's just more work in the mapping. If you want pure POJO s then use Hibernates xml mappings. Most complicated database schemas can be mapped and there are already a lot of questions on SO for them.
Post a question for each class and corresponding database tables/views/functions and we will find answers.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.