Got some idea!

This is just my second post and I really still haven't even figured out how to make my worlds to work in Blender. But thats not my question! I was just wondering if it would be possible to open up a new online Uru thing! It would be like Untill Uru (Free) and all the maps would be homemade. How hard would it be for me to start that. I also understand that I would probley have to get permission from Cyan!