The modelling is very good, but I have 2 very minor criticisms of the actual model itself...
1. The chuck jaws are too round, the 'insides' should be almost V shaped so they can close enough to hold small drills.
2. You omitted the holes (usually 3 at 120 degrees apart) for the chuck key. There is a hint of a hole that would suggest you have two at 180 degrees apart, but I've never seen a chuck like that.
They don't detract from the actual modelling though.
TC21.2 x64 Plat, Bld59
TC16.2 Plat, Bld54.0