Rightio, been a while but finally got an afternoon to work on this.
Firstly, string through holes. Did one practice run, using a similar method to my previous posts

1. Position bridge and mark holes.
2. Drill outside holes all the way through and inside holes halfway
3. Flip body and mark centres of 4 inside holes.
4. draw squares that would encompass the ferrule holes - makes sure they stay in line and evenly spaced
5. Drill Ferrule Holes
6. Drill remaining string throughs.

I used a hand drill and my notched square to help keep them straight - same as the previous post.
I did one more practice one on some scrap before biting the bullet.
Alright, here's the view from the top (After steps 1 and 2)
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After flipping the body and marking some holes. Very messy with the pencil marks!

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Breathe deeply and slowly, position the forstener bit carefully...

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Looks good so far! Let's finish it off

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Boo yeah!

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Question: At the moment the ferrules are just sitting loosely - I used a 3/8 Forstener bit to make the holes. Too large a diameter? Any tips for fixing them in the holes?

Also finished sanding today 400 grit baby!