nice project tews. I hope the stem height works out. I got it assembled with conversion bearings and it was too high, But I have a 750 so you might be ok. I ended up having a new stem machined. Def think about machining a bearing cover.
Theres a harley rear wheel spacer out there that works perfectly up front, just had to add a little taper to the edge, i'll try to find a part number.