That is one good looking mustang!
I would work on the headlights a little bit...the lines on it seem very out of scale and makes the headlights not as clear as it should be. It would look better if you sand away those lines.
Leave it aside, build another one and than get back to it.
IMO it's a very nice model of a beautiful car, it would be a shame not to finish it one day!
Most of the models I'm building now are older ones that were poorly built, and it's great to see them get a new life!
Sucks to see distaster strike!! Next time try using the pin technique to put the mirrors on. Never tried it, but from others its awesome. Gives the mirrors more strength and its easier to glue without a mess.
Hopefully this build will get finished in the near future.