Would some kind soul explain VW alignment for me?

I read that the Natural Turn commences DC & the Reverse Turn, DW - the opposite to the usual Slow Waltz alignments (or have I got THAT wrong?).

If you are going to dance several bars of each turn, before using a change step to go the other way, then I assume that I should aim to make a complete turn over each figure, and if THAT is right, how do I manage the change - calling for 1/4 difference between DC & DW, or back again?

Moore's Ballroom Dancing mentions starting facing LOD for both turns - which seems very sensible. I am confused...

It's best not to overthink these things. While the body is more or less facing DW at the beginning of a reverse turn, the first step is down LOD. Chances are, you do this all the time without really realizing it.