Lawsy mercy I have been trying to scratch a banh mi itch for a month! I've had two in town and the vegetarian ones have been disappointing.
A place I grew up near had curry mock duck (seitan) in theirs. om nom nom. I second the suggestion for sliced jalapenos (just seed them if that's too spicy). If you can't find daikon, another kind of radish might work, too.
Looks great! When I read your post, I absolutely thought it said "sent me a photo with quilt and completed baby" and I laughed out loud.... So much so that my roommate came to see if I was choking. Lol