The only thing you would need would be the new lower plate and motor mount(if applicable). The braces and top plates are compatible from V1 to V2(G1 to G2).
The new motor mount won't work directly with the old lower plate, either. It would need a spacer where the mount attaches to the x brace. The extra cell is the major change, but the new lower plate also doesn't use the additional aluminum side rails to help locate the batteries, but rather has a bend in th plate itself(lighter weight). Otherwise, they are both compatible with each other. If you don't use a motor mount, the new lower plate will bolt right up.