For an SG.....
JS 20 JR 20
OD 16 HA 15
DR 20 PA 12
IS 20 ID 9
RB 7 (cuz it will pop probably no matter what) SB 8
Even with a lvl 7 Coach this is impossible until he turns 31.
I wonder why you get those crazy numbers.
First of all, he will cap at
20 19
15 19
20 12
19 10
6 7
on the way up to this (this should be 11 pot) when he is about 29.
2nd, how do you want to get 20 drive, but limit handling to 15??
This build is not very usefull in my opinion because he lacks defense.
A better approach would be something like
19 16
19 20
20 12
17 11
6 7
at 27 years. That's still a very long shot (no stamina or free throw training at all), and most likely not the best build, but at least possible and potentially viable.