Hi Chumpy36!
I’m with StickInTheMud57 on this…. Ply or OSB backed cushions can be heavier and possibly problematic when moving them around…. Generously Radiused corners and edges will soften the bangs and bruises as well as improve the durability of the fabric at the edges.
Having redone old chairs and stools via the board and “staple” process several times over the years I’ve found that unless using a proper pneumatic staple gun and upholstery staples that come with a glue varnish it’s been disappointing over time… the hand staplers are tiresome, don’t give particularly consistent penetration and pull themselves out with use. If doing something by hand I’ve found that quality HD capped upholstery tacks work better and are actually easier.
Given that hard backed cushions are a “one-shot” process a good tight weave heavy durable water and stain resistant fabric selection is key along with adding twice the “cushion” thickness (otherwise the “bum duration to uncomfort factor” tends to be shorter).
In Over Easy we when with the “all soft” approach with our cushion upgrade. They are lighter and easier to move around when accessing the various compartments. We also tired out the overfold and HD safety pin process which is working well (as we didn’t have access to a working sewing machine and didn’t want to hand stitch a cabin worth of cushions. But that was our choice and worked for us.
You have your own reasons for going hard backed which is what works for you. Going hard backed could allow you to remove the separate hatch covers if you so choose which could actually simplify things in your usage plan. Your boat/ Your rules.
Congratulations on the upgrade!
Post pictures and details of how things work out.
We’re sure that it will be great
It would be nice if you could also post it in the “Mods” section if you can.
Best Regards
Over Easy



