Hi Simon, I have one of these which has similar issues to deal with as yours. A couple of things, hope you haven't sanded the top too vigorously yet. If you look closely the veneer on the top layer of ply is as thin as usual, the lower layer of ply acts as the base of the rebate for the purfling.
Also, have a look into the hole for the selector switch, that there is enough clearance to get the switch in place. On mine the hole is partly blocked by the inside edge of the body.
Otherwise, happy building.
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