...so please guys, why not?
1. The price of the turbine engine exceeds the value of most light aircraft. Mass production will not reduce engine prices significantly because of the high precision required and expensive temperature-resistant materials.
2. Poor efficiency of gas turbines at low level and low speed.
3. Noise.
4. More fireproofing / themal blanketing required. Heavy and expensive.
There have been many attempts to fit gas turbine engines to small aircraft and even road vehicles during the last five decades. None of them resulted in series production.