Thats a great idea, wonderful if someone can pull that off,
just shooting another idea out that like yours- - remember that episode from Voyager where there was a planet made of water, where the Delta Flyer was sent to repair its damaged power supply, I think that would be a kewl terrain too, just a suggestion lol but like I said early I would love to fly around the inside of the Enterprise or defiant, or etc...
Adam out