Hi Nicholas,
Thanks for your interest!
Mario-net is sadly quite out of date, bit rotting for over a year now. The shortest path to getting it working again would definitely be to start from scratch on the model, perhaps preserving some of the dataset code.
I have some hope to find time this summer to update it and perhaps do a blog post, talk, or similar. We have all learned a lot in the last year, and I agree that it would make a compelling example.
Warmly,
-Harold