Marine ply fins?

Do you know what type of wood he uses to build these fins? Will Marine Ply Meranti BS (British Standard) 1088 with WBP glue give similar results with the dark glue lines? I’ve used birch with good results but the glue is not dark? Does anyone know about the BS 1088 plywood? Thanks, Zack

hey, I recognize that template

edit: although it looks slightly different near the tip

regarding the ply, sorry, I can’t help you there.