I'm restoring a 1983 Oday 23 and need tips on recovering fore and aftcabin cushions. Probably OEM, they look like what you used to see in RV's, worn, stained, reasonably serviceable, just sort of "old motel mattressy" with some places where the sponge/foam stuffing has deteriorated. The first mate is handy with the sewing machine, but any ideas out there for material, like duck cloth vs polyester vs cotton, zippers vs pockets, etc?