[Zope] Going to 3.0

We use a Psycopg connection, and Z SQL Objects... We don't have any programs written in python that use zope interfaces and so on. We have a entire site written in DTML in Zope 2.x. Now, after some discuss here We want to migrate it to Zope3.x. and start to develop using the zope 3 facilities and OO and ZPT. I already install Zope 3.1.0 and try to copy the Data.fs. But it produces a lot of erros. How can I handle this? Will exist a way to migrate from Zope 2.x to Zope 3.x? Thanks in advance. Fernando Lujan