But, if you have a very large database and you are not feeling like writting lots of boring ddl conversions, you know very well you can use Sybase PowerDesigner (at least app. modeller) for converting a model that you can obtain by reverse engeneering. If you do not have it, yet...
BTW, aren't you sorry for such a waste? Sybase ASE is a server on wich 95% of Wall Street is based... . And is a great technology. I'm sincerely sorry for you...
At least if you were taking to Oracle 9i, that is more supportable...