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My take on this, Make solids, place, rotate as you want, then outer shell
Seems Dave has made a perfect cool DVD about wood Working! π Not sure that is also an EBook (?)
About Design itself Dave will give you better advice than me! π
http://s3.amazonaws.com/finewoodworking.s3.tauntoncloud.com/app/uploads/2016/09/06021211/sketchup-basics-.jpg
Cool!