Hey
So far good job on model. But i think you could make a few changes to make it look better.
Double chamfering, i think its not so good idea here, you are wasting some good amount of polys on those, they can be used much better on area which needs them. Half sphere on side, in my opinion can use much less polys, and still have good shape. Since you got some polys left, i think its better to use them on adding more bigger details to model making it closer look to concept, adding some nice shapes on mode. The width of model can be a bit bigger also. Well since its a wip i hope you going to add more stuff to it
Good luck!