One of the benefits of the discussion as compared to discussing this here on APUG is that you can relate in detail what you expect the scene to be like and what results you are looking for.
Of course if you can talk to an experienced photographer who uses large format transparency material for subjects like this, you might get the same benefit.
It is the benefits of a back and forth discussion with an experienced user that you should seek. The web isn't ideal for that.
And a discussion with your lab will also help you if you are considering multiple uses of the final product (e.g. scans plus ???)