ImperialFighter said:
None of the miniature/kit images I looked at really helped me in this instance brimforge, as I couldn't find one taken of that portion of the X-Wing from that exact *angle*...and they didn't really convey the actual size of the large gap between where the Artoo and engine would be on the full-sized studio version. Also, I'm not sure how accurately-proportioned some of the models I looked at are. In addition, there may be a bit of difference between how things look when filmed by a movie camera compared to how things look when someone takes a snap of a small model, but I'll be interested to see your pics.
As your last sentence above suggests, if the camera POV isn't positioned in a vantage point somewhere in the gap between Artoo and engine, then I can alternatively look on it's vantage point as being positioned somewhere where the engine would *physically be* instead. Either way, I agree the engine would have been 'removed' from view because we wouldn't actually see it from either of these POV's I've described.
But equally, I like the look of Ronster's mock-up too...although I'm not sure how many similar instances adywan would end up having to do this throughout the original trilogy, or if he'd want to do all that additional work, if so.
Ok, the camera-angle from where we are viewing, is not from front or level side, it's more up and to the front position, that's why some confusion happened, as to how and what with the turbines ;-)
you are correct, not all models are screensize-acurate and many got some details which are different to the real ones in the movie, but overall the ratio is somewhat useful, if one wants to check position or viewpoints like this.

I made some pics with varying angles, the bottom is a small model-kit, R2 is not plane with his socket, so he sticks out and is more visible than he should be, but this shows what problem the cameraman maybe had, if the front turbine was in place ...
the middle two are from the Hasbro "BIG" Dagobah X-Wing, should be as screen acurate as any toy-model be possible, just for comparison, to show how the turbine would be set if it was in the picture.
All pics are as is, no corrections, only different POV, so the verdict: for better view on R2, the front turbine was removed or as I guess, the set where Luke later enters his X-Wing to fly to Bespin, is on the "other side", so "half" was built and used twice.
Edit: not sure if they had only one X-Wing on set, but it could be. That would mean it was modular to replace or remove parts ...
interesting how Kersher brougth McQarries concept art to life :-)
http://www.moviestillsdb.com/movies/star-wars-episode-v-the-empire-strikes-back-i80684/3119745e
http://www.moviestillsdb.com/movies/star-wars-episode-v-the-empire-strikes-back-i80684/1ef5638a