those nacelled could use some updating. For example, you know thos "fins" on the back? How about doing 6 of them on each nacelle? Then the main intercollers in the middle, thatb have been NX-ified, about about adding those to the inside and outside of the nacelles, and maybe the top too. Really pack the gear on them nacelles, as they'd be the most advanced tos style nacelle ever built.