Plate 2 covers the intersection of a sloped square section stick piercing a cylindrical post:

Plate 3 deals with the intersection of a sloped smaller cylinder meting a cylindrical post:

Plate 4 gets us into cones, the first problem dealing with a cone pierced by a horizontal cylinder:

I will now admit I am a cone 'head'.

Plate 5 is a cone pierced by a smaller vertical cylinder, offset from the centerline of the cone:

Plate 6 was the most complex of this set, involving the intersection of an angled cylinder partially occluded into a cone:

Plate 7 was a different sort of beast, the intersection of a vertical and a horizontal cone:

Here, one can not pull points in the same way as with other intersections, but must construct auxiliary planes which intersect both cones.

Detail:

If you're hankering to see some sort of woody manifestation of the above type of problem, maybe a bit more difficult, volume dialed up to 11, there are no shortage of

The preamble to a carpentry challenge like this - the minimum 'get a foot in the door' move - would be mapping the surfaces of intersecting cones.

It appears that the upper angled cone can be removed easily:

Scalene fun, Part II - it is the same model, taken off the support stand:

Credit to: RWLV

Finally, there is plate 8 which deals with a sphere occluding a cone:

This was a simpler problem than the cone meeting cone, as it turned out. Almost easy.

The next section in the text deals with regular plan hips, and area with which i have some familiarity, so it will be interesting to learn some new approaches.

All for this time. If you're feeling inspired - and I hope you are- go lay down some lines and cut some wood.