My plan described earlier has worked
First light enabled and it was easy to find the 4.5mm central hole first go with a 2mm bit.
I created a slot for the light itself.
Just a position lighting board to make and fit.
EDIT
I'm also making a capstan as the MMM fitting is so small and out of scale that I've actually lost it anyway
I'm sure most of these supplied fittings are nearer 1:48 scale, especially the stairs up to the wheelhouse! far too narrow.
If I was to build another there are many things I would have done differently in hide sight.
Any of you that haven't finished the decks yet I STRONGLY advise that you move the whole deckhouse forwards 10mm so the stairs don't land right at the edge of the for deck. This is WRONG but to MMM supplied plan