Unfortunately the model properties are limited to the ones below through the API (let me know if you want the Python script to obtain these). But. @Alessio_Pagliano published a TOTALLY amazing PowerPoint deck on how to estimate the size of the model in a module (see the attachment in his post). Taking this one step further you could set up a notification using the NewUX to alert you if you reach a certain limit. Please let us know what you decide to do. I think we would all benefit from anything you discover.