For the most part, very well done.
Doing this in CAD you should have your ORTHO or POLAR turned on though, and your END snap running.
The only mistakes that I see are that you should have also shown HIDDEN lines,
which would be on their own layer, with a different color, I use 11 for them, and their linetype HIDDEN.
There is a small mistake in the lower right drawing, where the tapered face of the upright meets the slab (at the bottom, right?)
These are reasonably challenging, for purely geometric shapes, looks like you have got a pretty good handle on it, despite those omissions.