Zero chance he's a first rounder.
Many don't even have Frank Kaminsky as a lottery pick and have him as mid-to-late first rounder.
The question regarding Hammons is probably his ceiling. On one hand, he's improved considerably, become more consistent and has the size - and is older for his age. On the other hand, he's fairly limited offensively, still disappears/inconsistent, has some issues still one on one defensively - and can come back and be on a pretty good team where he has potential to be a Big Ten POY, but would be even older.
The question is - would he be able improve in his deficiencies enough to improve his standing significantly with one more year?I think he could be even more consistent and dominant given his Big Ten season this year, but I don't know if he'd extend his offensive range much in 1 year.