Well, I wrote too soon.
The wall tool draws wall sections and cleans up the intersections properly, but there is no apparent way to adjust the thickness of the walls.
And, dimensioning the walls is completely counter intuitive. For instance if I have dimensions set to feet & inches, when I draw a wall .75 units long, it has a dimension of 9 (no units shown). OK, this is 9 inches and I understand that part, but if I draw one 1.5 units long, its dimension shows as 1' 6", which is correct, and now at least displays the units.