Hi Tom,
Thank you for buying my eBook! :-)
Regarding your questions:
1 - First an important note: in my eBooks (all of them) there are links to other topics, tools, etc. So, by clicking on the links, you will get additional resources. This is important, for example for your first question "Alignment on Table top onto the legs? I was only able to get it aligned by switching to 2D and “nudging” the top onto the legs. Is that the best way?" => the step 8 of the tutorial (page 66) explains the alignment and it is linked with the alignment tool, that is the best way to align the elements.
2 - Regarding your second question "you started out with a 12 point cylinder, but when I drew my circle, it only had 4 points. Should I have used the multi-gon tool? And in either case, how did you get it to 12 points?" => in the tutorial, the Step 1 reads "using the 2D drawing tools create a polygon => set the curve tension." => as you see, I didn't start with a circle. Now, if you create a polygon with 12 sides, you will get 12 points. The "curve tension" (this concept also includes a link for additional definitions and resources) converts the straight lino to curved lines, depending of the value of the tension (more tension = more curve).
Regarding the third question: "The remaining elements and points can’t be selected and modified, as shown in the image/" nope, as you can see, the image is showing the hide detection, therefore these points can't be selected.
The problem with the Sketchup objects is the number of polygons that make the objects very heavy (in kb)and therefore they will slow your 3D process. I'd recommend the 3D Custom Workshop. If you have my eBook "Importing, Exporting and Printing", check the polygons issue, starting at page 13.
Patricia
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