I settled on the final design (but have plenty of spare material if it doesn’t work out or there’s some disaster).

Made a template with MDF, doing some high school maths with Pythagoras to work out the bevel to get the guard the right size as I was cutting from the bottom edge. It was very fiddly with the jigsaw.

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I was chuffed with my baking paper template to get the pick up position. It may have been a terrible idea to cut this out now but we’ll see. There is wiggle room for the guard to get it lined up properly. Measurements were based on both the positions of the bridge pickup and the pickup placement in the original pick guard.

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As you can see no expense is spared in my high tech operation!

Quite happy with the final results...

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Not the exact position but you get the idea...
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Will get a drill bit to do the screw holes later.