Hi Ralph,
adopted the brute force solution: After I got used to my 86 7-seater space and backrest angle, I removed sink and stove from my 80 Westy, cut off the upper part of the vertikal board behind the driver seat, installed a piece of plywood onto the now upper horizontal board of the cabinet (to cover the drain pipe holes), and got a Coleman stove (didn't use / miss the sink too much).
Regards from Michael, Germany