Selecting both halves of this face I then proceeded to use the bevel tool to create a border around this newly created face and then extruded the face inwards to create the depth needed.
Next I needed to make some new cuts so I had the vertices required to make a smooth curve for the engine detail in the back. To achieve this I made multiple cuts on the same line using the multi-cut tool at different steps (25, 50, 75%). Next I moved the vertices around on these new cuts in order to create the curve required. I then deleted any unnecessary edges so I was just left with the 2 faces.
With the curves created I then proceeded to extrude these faces to start shaping the protective shell around the engines. Once extruded I then proceeded to bevel and inset these faces, much like I did earlier on with the back ship detail.
After this I created a polygon pipe shape, changed the thickness to be very thin and then scaled the front and back of the pipe to create an angled "jet engine" style object. I then aligned this to the newly inset face in the engine shell and duplicated it 3 more times to create all 4 engines found on the back of the A-Wing.
The next part of the back engine detail I began on was the larger engines found on the sides of the back end of the ship. I started off by creating a normal polygon cylinder shape and then deleting the edges on face shown below. After selecting this face I then bevelled it to create this edge. After creating this new face I extruded it to inset it into the object and then bevelled the now inset face to create a second border. Next, I extruded this face again to inset it further into the engine cylinder. Finally I made sure the outer edge of the engine was flat to match the schematic as shown below.
With the back detailing finished on these side engines I now started to extrude faces at the front of the engine so I could connect it to the back of the ship. I made this extrusion in multiple steps so I could scale down the face as I went and create a small curve to match the reference images and schematics I have been working from.
With the side engines connected to the back of the ship, I now focused my attention on creating the small fins found on the top and bottom of the engines. To begin, I made a simple cube shape and scaled/stretched it so it matched the shape in the schematic. I also added a few extra cuts to the front face of this fin so I could add a curve to the front.
Next, through a series of extrusions on the X-axis, I expanded the wing along the Y-axis, keeping the shape as close to the schematic as possible, deleting unnecessary edges after making this curve.
I also repeated this process at the back end of the fin.
With the curvature of the fin matching the schematic, I now rotated the fin slightly to match the angle found in the front schematic.
I then duplicated this fin and adjusted it slightly to use as the bottom fin on this engine. Below is the finished product of these 2 fins added to the engine.
With the fins now in place I could add the small "ring" detail found at the end of the engine. This shape is detached from the main engine object so I began by extruding the back faces of the engine out twice, deleting the faces created in the middle. I then bridged the edges on the floating ring that were missing faces and scaled the inside edges up to make the ring thinner, matching the reference images.
Once this was completed, I duplicated all of the objects used in making the side engines and scaled it by a negative number on the X-axis (in order to flip it horizontally). I then moved this entire group of objects to the other side of the ship to create the second side engine. Below is a screenshot of the finished back side of the model.
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