Hey I have no problem with the additions that can't be confirmed or denied (old main bell, boarding house location, preacher, playing football in the quad) their's alot of embellishment that can go on but lets get a few areas of the story in concrete so that no matter what is added those elements stay the same and are based on a true event. Check out Tech's First Year Experience website for what I think is the best base story
http://www.latech.edu/fye/legend.shtml The main story is less than 400 words; I can get it down to 15 points that should remain the same no matter what,
- 5 Tech Students
- Fall of 1899
- Heading home from class
- Find bulldog under tree on edge of campus
- Bulldog follows them home
- Sleeps overnight
- Fire breaks out
- Bulldog goes room to room tugging sheets to wake up everyone
- Everyone escapes except one student
- Bulldog goes back into burning house
- Last student comes out
- Bulldog never exits house
- Found dead next day
- Buried in red & blue jackets under tree where they first met
- Tree location UNKNOWN
Add all the detail's you want, heck make it Halloween and they're dressed up like characters from the Wizard of Oz (which I guess wouldn't work since it was written in 1900

), but don't violate those main points and I think everyone will be happy. Sorry if I rained on your parade...