Re: Here's an interesting poser that I have posed elsewhere.
"Given adequate funds, would it be possible to build a jet-engined full-size X-Wing that could fly like a normal aircraft? "
Given the improbable aerodynamics of the Harrier, or the SR-71, I would suggest that getting a modified X-Wing to fly would not be an insurmountable challenge, just an expensive one. At a guess you'd probably only want two rather than four engines, and you're then perhaps drifting towards and ARC-170.