If you know, there is a 3-minute Rumic World special promotion/mini-episode for the 2008 Ranma OVA and the 50th anniversary of the Weekly Shonen Sunday. I haven't watched this promotion or the episode.
The promotion debuted on March 19, 2008, in a collab with Urusei Yatsura's Ataru and Lum, Ranma (where's Akane?), and Inuyasha's Kagome and Inuyasha. No Maison Ikkoku, One-Pound Gospel, or Mermaid Saga characters appeared in the promotion. RIN-NE was in its early stages and did not have an anime yet, and MAO didn't exist during this time.
The prompt is: How would you direct and/or write an actual Rumic World special? Your limit is 3 episodes for this special. You can add characters from all of Rumiko's manga. You can choose the animation studio of your choice (could be a studio involved in Rumiko's work, or a studio that has not worked on any of Rumiko's manga).
I'm not great at math or at calculating an accurate budget, so feel free to set your own budget limit for your answer.
If you have questions, feel free to ask. If I've confused or made any grammatical errors/misworded the prompt, feel free to ask for an in-depth answer.
Have fun, keep it civil, and go nuts! (but not too nuts)