Assuming you don't want to add any new business logic or dashboards to the NUX but you simply want to migrate the dashboards to the NUX then you don't need to create new modules or new actions. You simply reference these artifacts when building the board (cards) and the worksheets in the NUX
Einas "Give a Man a Fish, and You Feed Him for a Day. Teach a Man To Fish, and You Feed Him for a Lifetime"
Please note that while you create boards/worksheets, you will have to use receptive cards to represent data/ actions from the models. There is no need to create any new modules/actions as such and you will have to use the existing ones only.
The best practice says that you should have views in your modules to be used in NUX for the cards. You can also use the power of custom views in NUX (which has much advanced conditional formatting options).
Regarding actions, you can have imports/exports/processes/forms(you create in NUX which helps you create an item) configured as an action card.