Hi everybody !! I am new to the RC universe !

I have two quick questions regarding widebody 40 kit. ( I guess many people already built one like this)

1) Is the supplied firewall (soft ply~3 mm) strong enough? (with OS 46 FX)
I am thinking of attaching a thin plywood ~ 3 mm to it.

2) What will be the weight difference between using monokote and spray paint(glass or silk)?
or it is not a good idea to paint it because it has many weight saving cutout.

thanks very much

Hua Chu