I've missed this thread completely , had I seen it I wouldn't have bothered starting another. Tch tch.
However, Yofy's point about remaking the v-berth mattress from two pieces without that silly filler bit is on the money. I did this with PB and it worked a treat.
“Give a man a fire and he's warm for a day, but set fire to him and he's warm for the rest of his life.” Terry Pratchett