Considerations When Creating BizTalk Projects

We had Covast EDI schemas about 29 MB in BizTalk Project and when we try to build it in Visual studio 2005 throwed error " CS0013 "Unexpected error writing metadata to file " the reason is the limitation of file size.Microsoft has recommended for 10 mb for a biztalk project.For more Information
http://msdn2.microsoft.com/en-us/library/aa561979.aspx