Real bummer about your Alpha, but it looks like an easy fix. I would suggest a little 30 minute epoxy on the firewall. 6 minute seems to cure a little to fast for my taste, and becomes somewhat brittle. 30 minute sets slower, gives you some time to work, and seems to cure with a bit more tendancy to absorb more vibration. Some Bamboo sticks, or Spruce tri stock on the front side of the firewall in the corners will also help to ad reinforcement to your firewall and the Planes Cheeks. Don't sweat the little mishap, it happens to everyone every once in awhile, and the thing to do is just get it fixed and get back to flying it. The Alpha is a very good flying Trainer Plane, so it is well worth your time to keep it going until you move on to something else down the road. Its when you have to try to figure out how a hundred different pieces go back together is when it gets complicated.