I'll preempt future comments that lithium batteries can catch fire too. I agree with that statement but still think the risk is mitigated by not going with gasoline fuels.
It's one of those "impressive that it works at all" kind of things. If that's what you want to see in the air, then do it. If you want to watch your one-off custom plane that represents hundreds or thousands of hours of labor fly, you push it with a fan.
What they really for this kind of build are RC turbofans, which are extremely uncommon. This thing puts out over 300lbs of thrust at full throttle: