Step 4: Modeling the bottom part
There are many different techniques that can be used to tackle the bottom part. Here is one of them I came up with. First, make a simple "poly Sphere" and set its parameters to the following:
- Radius: 7.5321
- Subdivisions Axis: Â Â 20
- Subdivision Height: 8
Make sure the sphere radius is close to the radius of middle part; don't worry if they don't match exactly inch by inch together because we will merge them together later. Also, you notice that the number of subdivisions differs for each part. Again, don't worry about that as later we will add and delete some edges to the middle part to match it with the bottom part (Fig.18).
Use Select >Select Edge Loop Tool to add a new edge to the sphere where the middle part ends, so we can delete the upper half of the sphere (Fig.19).
Select all vertices at the bottom of sphere and scale them on the "Y" axis until they are lined up.
While they are still selected move them up on the "Y" axis to line up with its upper edge. See the following image and use it as your guide (Fig.20).
Here is what you should have so far. Press "3" to see the object in smooth preview (Fig.21).
Next, add new edge loops at the end of the bottom part. Assign a red color material to those polys that we don't need to work with. This way, you can focus on other parts and won't get confused later when we extrude the polys between them (Fig.22).
Now, try to extrude the polygons at the center to something similar to following image (Fig.23).
Next, we select the polys between those polys we already colored and extrude them two times towards the inside. I have selected the edges where the second extrude should occur for your guide (Fig.24).