Some test placing of the aluminium pickup surrounds and the steel bridge.
Attachment 26844
I could measure the angle of the strings and was pleased to find that the strings lined up with the bridge and gave an acceptable starting height. Phew doesn't cover it!
Attachment 26845
You can perhaps see that the bridge is already slightly recessed, in the end I took it down another 1.5 mm. It is now on the original surface of the guitar body.