Damn, i see that now..
mm, the joys of a modified frame! you may also have to flip the position of the chainring, so we don't have a collision with the frame.
...yeah, i would personally put an edge on that plate.. i'm told those slidey bits are for an additional tensioner.. i can't see you using that feature.
That BB should be pretty damn strong if you can get those last bits of cup strength. I'm kind of dazzled at how much nicer of an interface you have.. you may have inspired me to buy a modern bike, lol.