Will this system fit the old tub location 30 .in x 60 .in with a kerb at least 4 .in high. I need the 3 side panels to be 8' tall?

The wedi 36 .in x 60 .in kit could be cut down to fit the 30 .in location but only comes with enough wedi board to cover 3 80 .in walls, and the foam lean curb is 3-1/2 .in tall. Might be better to buy the pieces that you need separately.