And private pilots need to be smart about how current they are. How quickly can you adjust to an EFATO , or conduct a forced landing. When was the last time you actually practiced any of those life saving actions?( you know- all that boring crap you leant years ago) When was the last time you were assessed? .. Is an AFR enough? If you cut corners by putting the wrong sort of donk in an aircraft, or cut corners cos lets face it , it's not cheap, you better be ready.
If your gonna build your own, at least make sure you aren't the weak link .