Hi Melodie,
If you would like to get as much assurance as possible of being able to have an internal pouch constructed in case of bladder removal post-radiation, well, it is possible, but considered very tricky. You would have to be sure of getting the best surgeon in this field, one who has experience in this situation, one who has operated on a lot of women.
If that is possible for you I can track down some names (where are you located?). I know of a woman who did the radio-chemo bladder sparing route, then needed bladder removal and successfully got an Indiana Pouch. She interviewed many surgeons till she found ones that would agree to at least try that route.
And yes, there is some damage done to the intestines around the bladder, or behind it (I"m not all that knowledgeable about where exactly these things sit).
Take care,
wendy