Re: Caution! Fenders are Death!
The only problem here is the lack checking and double-checking your fasteners for the fenders.
Buy a tube of LockTite blue when you buy that engine and take the time to go over all the potential bits that might loosen on the bike itself, before you put that engine on. Check that there is sufficient clearances for the tire and any stray debris it might pick up between the fender and the tire. LockTite and torque all small fasteners.