Not sure if this helps or not;
Original deck schedule for early ‘70s 23’ Sceptre; top to bottom (from Feb ’73 Boating, Boat Test #207)
Gelcoat
1 layer 3/4 oz mat
2 layers of 1 ½ oz mat
1 layer 22 oz mat
1 layer of 1 ½ oz mat
3/8” end grain balsa
1 layer of 1 ½ oz mat
1 layer of 22 oz roving
Sounds like yours might be similar but with plywood instead of balsa?
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