I am not into building these.....but take a very heavy interest in these things......
And buying a gas turbine engine makes little sense......u shud build ur own......
Atleast experiment using some aluminium scrap.....
If u got access to a CNCmachine, everything is possible for u......
gas turbine/ jet engines are extremely simple in design......and can be built at home from scratch....
Did u hear about that engineer from the 90s who built an entire heavy bike , including the engine ( he didnt just assemble it, he prepared a mould and did all the melting of it and pouring into mould right there in his tiny garage , and all the parts were built in his garage..... ) , More over, his design and bike was so good, it won several motogps......till his death....