Aeajr, I have a Spirit kit-built. I just retired from getting worn out. It has much repairing from many light crashes. I'll tell you though, that plane was built like a car that has crumple zones to protect the passengers. It may sound a little weird but I call it a marvel of engineering. First thing to say, make both tail surfaces larger, I have heard somewhere to 150%.  I went with 120% and that was perfect.  Also, lead, lead and more lead weight in the farthest forward compartment (right behind the nose cone).  I could not figure out why it wasn't flying right untill I added weight into the second compartment behind the first one. I ended up at 13.8 oz. of lead, and it flew like a dream.  But - to get back to crumple zones, I have had so many crashes and each one was immediately fixed and flew within ten minutes.  The wing joiner with many layers of plywood and aluminum would delaminate, and just glue them back together, stick them in and you're flying again.  If the fuselage hits the ground hard, the rubberbands (if you don't have too many) will break and allow the wing to break free from the fuselage. Both the wing and the fuselage are more survivable this way.  The vertical stabilizer breaks off and also glues back on in a jiffy.  I have had many crashes that looked bad and in half an hour flying again.