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1 glued in place and sanded flush.
3 and 4 in place, with overhangs.
Note sharp bevel for 5. Just like tub and ski.
2 glued in place.
Glue S-3 in place. S-3 is 1/16 ply.
Glue S-4 and leave an overhang in the rear. S-4
is 1/8 ply.
It should be aligned to the “break” where the
sponson bottom changes angle (for S5) and
overhang at the rear.
Once S-4 is cured, sand the front of S-4 flush
with the forward bottom. This is exactly like the
forward tub bottom. Do not round any corners.