Size dimensions and location dimensions are different in that one must be set and changed, the other (size dimensions) just happens as you click and such.
Datum dimensioning is easier to modify later. Chain dimensioning presents constraints.
A written description of an item presents a lot of information that must be processed and "seen" in the mind. A dimensional drawing is the object, with its dimensions, in front of your face.
All of your creations look good but it'd be hard to mess it up unless you do something entirely different. Instead of adding onto the base when making the other two shapes, it might be easier to just make the entire figure and then extrude it, that way you wouldn't have to measure out separate parts several times in a row. Yeah looks good.
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