Wow! This is an amazing suggestion! (My username actually came from a monster type in the Baldur's Gate games - it's a type of giant mushroom from the DnD universe . The BG games two of my most favourite video games from the late 90s, hands down!) The 0ad engine is probably perfect for that style of game. There'd need to be major changes to the simulation code (definitely not as simple as replacing the AI scripts), and indoor scenes could be done with only a few hacky modifications here and there. It's totally doable from a technical perspective, imho, and because most code would be reused, 0ad would also benefit hugely from the added development. Anyway, if there are other people who are seriously interested in this, count me in! (Just imagine, it could even be done semi-professionally if it went the Kickstarter route and all that)