ÀFAIK, custom tables are nothing but database tables and Kentico has built API'S TO get data from custom tables.
Considering these two facts. I think you are all set to do that.
Did you face any challenge doing so?
Got these two links for you.
- MVC code for Dancing goat website
https://github.com/Kentico/Mvc/tree/master/src/DancingGoat
- Basics of MVC
https://github.com/Kentico/Mvc/wiki/how-it-works
Chetan