Here's one more analytical projection model:
https://www.basketballanalyticsbook.com/2015/04/17/final-2015-cpr-ratings/
Interesting: Looney, Portis, Turner, Payne, DeAndre Bembry(? - seems like he's returning to school) project really high. Booker, WCS, Sam Dekker not high at all... Oubre and Kaminsky - middling projection.
Thanks for the link. Let me try to add a little bit more based on my interpretation of what this model is trying to do:
The model's innovation is that it tries to factor in inconsistency more than other models (which probably don't do it much at all). The modeler (Stephen Shea) believes that part of the problem in trying to get success from draft modeling is that college freshmen (in particular) are very inconsistent. Great games might be followed up by a couple duds. Thus using per game or per minute averages doesn't really give us the true likelihood of success (since inconsistency is usually mitigated with age/experience). So he tries to factor this in mathematically.
Like most other modeling, it tries to factor in age/college class. Unlike Vashro (and I think Pelton), Shea doesn't really use Combine measurements, but relies solely on box score data. Like other mathematical modeling, it can't account for work ethic or personality factors.
Shea has noted in a few posts that it's entirely possible the model is overestimating players with high 3pt % on relatively few attempts (Portis, Looney) especially if there's reason to believe those %s aren't true representations of their shooting ability, and that he believes Kentucky's players are underestimated because of the depth of that team this year. Like any good modeler, Shea doesn't believe that the results should be considered as the final answer, but that they can be a useful guide along with other data.
In other posts besides the one mentioned above, he's given a kind of yardstick on how current NBA players scored (I presume that he believes these "yardstick" scores to be basically accurate, though I'm not totally sure):
10+ clear top-notch player in the NBA (KD, AD, Carmelo, Duncan, Love, etc -- KD and AD were both above 20)
8.9 Paul George
7.6 Andrew Wiggins
6.0 MCW
3.8 Aaron Gordon
2.8 Harrison Barnes
1.8 Dion Waiters
This year's class is rated thus:
10.4 Russell
9.1 Okafor
7.6 Towns
7.1 Looney
6.5 Portis
6.4 Turner
6.2 Payne
5.6 Johnson
5.5 Jones
5.2 Winslow
5.1 Hunter
5.0 Wood
4.7 Rozier
Among others (the model doesn't rank prospects who didn't play college ball, though he has a few players in the rankings who didn't keep their names in the 2015 draft):
#17 3.4 Kaminsky
#19 3.3 Oubre
#31 2.2 Booker
#41 1.8 J. Anderson
#43 1.7 Hollis-Jefferson
#48 1.5 Lyles
#51 1.3 Dekker
For comparison, last year's top-21 prospects:
11.2 Parker
8.5 Smart
7.6 Wiggins
6.7 Vonleh
6.3 Embiid
6.3 Ennis
5.8 Napier
5.4 Anderson
5.4 Adams
4.9 Randle
4.9 Warren
4.0 Harris
4.0 McDaniels
4.0 Young
3.6 Gordon
3.1 McDermott
3.1 Austin
2.7 Payton
2.7 Carson
2.2 Stauskas
2.2 Hood