Anyway...
The front dropouts look like they have Suntour stamped on them.
The headset simply has Japan stamped on the front.
The frame is lugged.
Serial number only appears on bottom bracket shell and starts with SC (schwinn?) I forget how many digits, I'll write it down.
No badges or stickers on the bike whatsoever.
The seat has been replaced with what appears to be a springer from a much older bike.
Chainrings are cheap-looking and stamped(?) with the chainring guard made of the same piece as the large ring.
I have to take a closer look at the crank arms but I seem to remember them being Sugino, maybe not. I'll write more stuff down when I get home.
Any ideas?