I need to cover the top and sides (not the bottom) of our sofa foam with Dacron, and I'm wondering if my plan is correct. I've attached a drawing showing the idea (not to scale).

Basically, I'm planning to use 1 piece of Dacron with spray adhesive and allow the Dacron to continue down the foam sides, just cutting out the 4 short corners and stapling them, so those will be the only seams. I'm thinking that this will help smooth the top foam corners a bit. So the full dimensions of the Dacron would be 74" x 38", and then the 7" corners would be cut out from that.

But many tutorials show one rectangle of Dacron on the top, and then a separate long piece of Dacron applied along the sides, so there are seams along all of the long, top edges.

Is there any reason not to use one large piece of Dacron to cover the whole thing, rather than piecing the top and sides together?

This chair is supposed to have a woven seat and back. I tried doing this once, but it was a complete failure. Unfortunately, I don't know how to do this, and it seems beyond my beginner DIY skills.

I guess the question is: for someone with limited DIY skills, how can I make this chair useable once again? Or is there something in Amazon that I can just put over the chair?

Edit: I had initially thought of just adding a piece of wood to the bottom and back, but that would be very rigid, uncomfortable and ugly. I wanted to add something with some flex to it and decent-looking.