Hardwood Plywood Sheet (Th)18mm (W)610mm (L)1220mm from BandQ £19.80
Cut to (100x20) x 3
Screwed 2 of the cuts together to make it rigid and same thickness as the original seat.
Dulux trade primer 2 coats in white (courtesy of my shed)
Caprinol Outdoor paint 3 coats in blue (courtesy of my shed)
Added 2 hooks from ebay @ £8 delivered
Total £27.8
PS: I used handheld electric sander to smooth and curve the edges for a comfortable seating experience.
Might be useful for someone






