I have worked with the Translation Workbench as a Proof of Concept conversion. One thing is that there is a lot of pre-work that needs to be done to the BQY files using the provided scripts.
I only used the TWB to create the RPD. I did not have it create the Analysis, Tables, Pivots, or Charts.
A few things I found
1. The RPD that gets imported into the TWB needs to have just the Physical Tables imported
2. The TWB will not reproduce Report or Dashboard Sections of the BQY.
3. The person running TWB really needs to know what is going on in the BQY to determine which Query Sections need to move forward, identifying the Fact Tables in the model, omitting the sections that are used for parameter on dashboard.