Hmm... I'm still willing to help. I also think that lantz has a point, in as far as this being a spiritual successor instead of an outright sequel, for a number of reasons that he didn't cover.
For starters, I'm pretty sure that the Type-MOON community is, as a whole, not quite willing to have a BMW2, especially since the first one, to my limited knowledge, didn't work the way it should have.
For another, this project is what should set the English speaking community apart from the native community, in that the game made as a fan project should fill in any and all plot holes from the originals (like, for instance, Shirou's use of Excalibur in HF Normal).
Those two reasons come to mind almost immediately... I'm sure I can come up with more later.