Well, the idea is to start from the OT dialogues and then expand with pre-PT EU canon stuff, as long as it fits. After all, even if Star Wars's canon changed throughout the trilogy, its dialogues present no evident retcon. But it's not an easy task :D

I just noticed that if, according to the Guide, Anakin is 55 in ANH, and the Clone Wars ended 35 years before ANH, how could he've taken part in war being him only 20? :\

Does the Guide mention why and when did Obi-wan change his name to Ben? When did he served the Organas?