Dude, that's terrible! At least you were able to get 6 knee knocking flights of enjoyment. Still it is terrible that it crashed.
I guess I should have mentioned it early, but when I started this model and the fact I was/am going for all out speed, flutter was an item I addressed while building.
After making sure the hinges were firmly in place with minimal gapping, I went a step further and added some monokote over the hinged area to help keep that issue from being a problem. Maybe you might use that tip on your next model. But there it is. Some have even swapped to pinned hings and epoxy for that extra holding power.
BTW, watch Ebay regularly for the DA. I got mine, with shipping for under $100.
There are plenty of good deals on ebay.
I flew my DA at Hodges Hobbies this past Saturday. I almost left with another twin engine plane. Not sure were you live, but there is a Top Flight 310, fully completed ARF, with no flight pack or engines with ROBART RETRACTS alread installed along with a complete nav light kit for $400. That version used the fiberglass one piece body. It was 'VERY'' attractive.
My first dual engine was the Cider Hobbies dual ugly stick. You can find them pretty inexpensive. That would do a flat spin and hold/gain altitude! It was crazy watching that but fun to fly!
Good Luck on your next project!