I've sealed the edges with a water-based undercoat to protect them from solvents during assembly ~ including spray-paint ~ and lopped around 12" or 30 centimetres from the end of each lath, which were supplied in dimensions of 2400 x 25 x 6mm.
These will be used as the means for attaching the hydroski, for the density of most insulation foams like these is too soft for fasteners, at least in the absence of threaded plugs... and even that's a stretch as we know to our cost from hanging stuff from plasterboard.
