Recovering from a diabolical ear infection, which has made it difficult to concentrate on anything, let along aeroplane building.
Worked up a new water level from 10mm ID tubing, which appears accurate. Even when I sneak up on it :)
Started again, levelled the left wing, matched the spar, matched the right wing. Adjusted the incidence to dead-nuts-level, then rejigged the dihedral and achieved a rosy result. Incidence zero, and less than 1mm across all the WL 17.4 reference points. RESULT!
Fixed all together again with clamps and hot glue blox.
Drilled 2 Left Wing pilot holes with 1/4" long bit and fixed with steel 1/4" rods.