To be quite honest, I don't really know all the differences between the two. I would think that the front fenders and hood would work, as they look the same in size.
A 2 door grill, will go on a 4 door body, but the mounting holes for the screws/bolts don't line up properly. Zip ties work well for that though. Or even self tapping screws.
The frames between the two are similar, but different. Inner front bumper mounts are different, from what I understand, the two doors have bumper mounts on the inside of the frame rails, but the four doors have them on the outside.
I think the 2 door frame might be narrower than a 4 door's, but I could be wrong. I do know of people that have had issues trying to put a 4 door gas tank into a 2 door kick. The four door gas tank is wider and shorter, and a 2 door tank is narrower and taller.
I'd say if you're already that far into it, you have the knowledge that whatever can be dreamt up, can be accomplished. All you need is imagination (and the right tools
)
Just make sure you measure the frame differences.