Nice, though it would look even more feasible had You make it
look like it's having a metal bottom rear fuselage (jet exhausts!) and generally planes with that engine arrangement had engines positioned with exhaust (and whole engine) actually pointing slightly downwards (towards rear).
That what's called design flaws!
Corrections are left for some next versions...
That'll need a long heck of a landing gear...
Indeed... if you look closely you'll notice that they are positioned underwings and one in the front.