Frank, I hope not to be misleading. Having a further look at the SVA monography I still believe the struts were metallic. I hope not to infringe any copyright while posting some pictures.
As you can notice in the wrecked planes, struts are bent, not broken, nor burned and in my opinion this can be evidence of metal stuff, not wooden. As a matter of facts, Ansaldo main business was shipbuilding, so probably they found easier to source metals then aviation industries of the time. Just my opinion.
Ciao
Giuseppe