Yes, 1/32 ply was an acceptable wing covering baack then. Depending on how much or little the glass was sanded/smoothed, the plane could gain a lot of weight.

We used to use 3/32 sheeting on the wings, and glass w/ 0.6 oz cloth and resin. When the cloth was applied, we would use rolls of toilet paper to soak up the excess resin. You would hold the TP with your index fingers, like a dispenser, and roll it along the fresh resin. Roll it in the direction it DOESN'T unroll, and after a few passes, get rid of the wet paper, and then keep going. Worked great.