Hi Jer, the u/c and wing tube formers are 1/8 ply and the ones local to these are either 1/8 liteply or 1/16 ply. All the other formers are 1/8 balsa. All the sheeting will be 3/32 balsa.
As for weight, on my Skyline bipe i made this year, the fuz came in at about 1000g ready to cover, thats including canopy and rudder. Hopefully this one will be similar although there is a couple more formers. I think the weight is very comparable to a composite fuz.
Dan