Starting over can be time consuming. First try to salvage your airplane. Try gluing a strip of wood
along the top of your motor stick to stiffen it up. Even if it picks up a little weight you can still learn a lot from the experience. I've only built one complete "proto-type" airplane this year, but I have
built a second stablizer, and a third wing for that airplane. The fuselage has the same problem as yours, and needs to be fixed, but it's good enough to use as a practice airplane. If I were to build a second airplane it would include all the modifications and improvements. My students will also benefit
from this research. Building from any kit has the benefit that the designer has already gone through
this developement process, and probably has years of experience to draw upon when designing his
airplane. Read my previous post about the capability of the Freedom Flight design. I like it, but
all the designs, and kits I have seen look good, and properly built could be winners. Good luck, and keep us posted on how things work out.