Sheeted vs. Unsheeted
I got the unsheeted version 'cause I thought it would be easier to locate/cutout the AL ALY spar slots in the foam cores. Sheeting it was a no-brainer (I use vacuum bags) and allowed me to incorporate 2 oz. 'glass cloth (on a 45 deg. bias) between the cores and balsa skins - VERY strong - just for grins.
Mike