Ground out area on top of left and right forward stringers to allow bolt head and channel brackets to sit on top of stringer. As per rear stringers I have also made up support plates for each side of the forward stringers. The centre plate is extra large due to having plenty of room but especially because the centre channel bracket doesn't sit that far down on the stringer and will also help dampen any forward movement in an accident.
May consider spacing out centre stringer channel bracket to sit down on stringer like left & right sides.
