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.

The correct aligments in the V. Waltz are there for a good reason.
On a Natural Turn you must be facing diagonal to the centre.
If you are not facing diagonal to the centre you will over rotate.
The alignment for the Reverse Turn is facing the LOD.
If you are not facing the LOD you will over rotate.
Understand this part correctly. If we were side by side you in a Natural and me in a Reverse we would both be travelling in a straight line and neither of us would cross the others path
You are probably aware that changing from Natural to Reverse there are two different ways
One is travelling backwards on bar eight. The other is travelling forward
after bar eight. This is called a Forward Change . For a begginner the later is recomended The change step is on beats 123. This makes the Reverse starting on beats 2 2 3. The reason for this is obviouse. We have used the beats 1 2 3 on the Forward Change.
When changing from Reverse to Natural
LF forward facing LOD RF diagonaly forward facing diag to centre.LF closes to RF facing Diag to centre.You should back to where you started at the begginning.
Don't be conned into thinkig you have to have Fleckerls. There are many comp dancers who dont touch them in there routines
I wish I had been told all of the above when I first learnt the V. Waltz But unfortunately for me the person teaching I know now shouldn't have been
Also I was never told that the V. Waltz will go out of phrase on the Reverse and come back into phrase at the end of the Reverse.