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If you are considering the "finish the stubs by hand" option, you would benefit by using our implementation of the stubs. This is the MigrationSupport.dll assembly that is distributed with gmStudio. This assembly implements many VB6 intrinsic objects and methods as well as a replacement for the ADODB API using System.Data and SqlClient classes. You can see our MigrationSupport API at work in our standard samples here:
Here is the official statement regarding Runtime Library Requirements and Support
https://portal.greatmigrations.com/display/GMG/Runtime+Library+Requirements+and+SupportMore information on the runtime support library is in this article.