Battens already cut to length and drilled.   My circular saw proved capable of cutting a triple layer sandwich (once I set the cut height right). I used a different cutting pattern as I was cutting a maximum of 610mm - first a cut across at 300mm, then a second and third at 376mm. After that, I stacked the three pieces and cut at 276mm twice, so a total of five cuts.   First, I made the sled - I'd glued and screwed a length of batten across the panel, and just cut across usin