Hmmmmmm......... were the air bags discharged, does the pop-up bonnet system still work (if had fired it is an arm and a leg job to replace)
Just mentioning those, not seeing those accident pics.
Think you are right to take an engineer with you as that price/mileage, even with a Cat D, does seem very low to me, but good luck to you if it checks out and you don't mind the hit when you come to sell it.