I’ve actually a pair of these too, i found out at the bin several years ago and keep meaning to renovate, though I have a pile 800x38mm Afrormosia(or it might be teak) boards which is ideal for such a project.
The sides I have are quite ornate, usual cast metal but ornate in the way of flowers and other botanical shapes. I think the main central plant is a poppy, with petal type flowers, long grass stems and the like.
My intention is to paint each flower as a flower, say white petals, yellow center,greens,blues,reds etc and to do each and all in different colours, a bit like that style we see on canal boat painting. I’ve about 50 tins of Humbrol enamel in just about every colour, so i can be quite creative.
I just have to finally get around to doing it. I think it will make the bench(or wide single seat as its only 800mm) quite unique.