A few nice touches that I like here. the intro is taken from the fountain and casts Hugh Jackman as orellana and uses music and credit fonts from raiders of the Lost arc. Several scenes and clips are cut, including the ones that one might consider silly, that makes the film a bit more in the tone of raiders. Thirdly, mutt is not indy's kid, but merely the kid of his ex. This gives the film a more realistic feeling and I enjoyed it. The last line of the film was particularly nice. There are a number of small changes here and there including dialogue switches and bits of music from the old films
More info on the film:
http://ifdb.fanedit.org/riddles-of-the-lost-gods/
There are other fan edits of indy films out there, but I haven't been able to find any online