I just looked into the CDF of EAWPRO and it IS indeed Shreck's original watertower. The island it sits on was my idea, it's a standalone shadow replacement, if that doesn't bother you. It did bother a lot of people in the past, not being incorporated in the original model. You can do with it what you like.
Since you have so many TMOD slots it can easily be modded to be a boulder in the terrain to make landings more dangerous, I've used it that way myself too. It can easily be resized without altering the R/S.
VonBeerhofen