The strains are evident in the design for a new museum that will house the International Freedom Center and the Drawing Center, unveiled yesterday by the Lower Manhattan Development Corporation. The building, by the Norwegian firm Snohetta, is strangely seductive: with some fine-tuning, it could even become a fascinating work. It is already closer to the standard set by Santiago Calatrava's soaring glass-and-steel transportation hub than that of the site's troubled Freedom Tower, for example.