Starting on the mods needed to the body before doing any sanding.

Checking the fit of the Tone Monster SBK-3 preamp.

I managed to get all the pots flush except the mid with the large PCB on it by some elaborate winding of the leads.
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Neither PCB is near the edges so I'm pretty happy I can copper shield the cavity.

The areas marked in pencil will need to be carved out to allow the mid pot to sit flush.
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Checking that the pup leads reached to the small PCB on the balance pot I noticed the bridge pickup sticking out much too high. I hadn't noticed when I did the original parts layout.

Turns out the hole from the pup route to control cavity is misaligned.

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The normally the pup would have to lift a little to let the lead out from underneath. This lifts it another 3mm.

I filed down the hole to let the lead run flush to the floor of the pup route.
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Pencil markings are considering creating a channel for the leads giving even more flexibility in the pup height.