[Darth-Apple]

I like the idea, and would be willing to join once it's released. I think a more modernized name might help a bit. Besides that, the main advice I'd give is to make sure you have something about your forum that makes it unique, or at least interesting to join. As someone who runs a forum in a crowded niche myself, I can say that's a very important aspect.

As for ignoring theme compatibility, MyBB assumes a 1.8.2 theme is not compatible with 1.8.3. It will work just fine. The only time you will have issues is if you're trying to import a 1.6.* theme to 1.8.

Looking forward to seeing it released.