My advice is “get a gun ,shoot yourself in the foot ,go home!” seriously though the biggest headache is sourcing parts; the eb@y thing is killing off any chances that up and coming “builders” might get to aquire original parts or even reproduction bits; it is sounding the death knell for aerojumbles and what is left is going to far flung places, that otherwise wouldn’t get a look in (which might be fair and even handed, but b*gger that, I need parts now!!).