I think it would look better if the wheels and tank matched.
Other than that I wish I had 1/4 of your ingenuity and talent. The muffler core reduction was genius.
Your co-worker/friend is a very lucky person indeed. It's hard for me to figure out how you put so much time and effort into the bike knowing that it may be dropped or layed down right out of the gate. Hopefully your friend will get some good instruction before you hand over the keys!