First deck call the Canon deck at first try it fit with little sanding
,there are 2 suggestions in the book. One just install as is , or plank it with supplies part with will look better ,but will be hidden by the top deck ,dilemma ,I install one side of the contour and had minor adjustments, right side glued the part end to end and it 3mm to long,
i will plank the lower deck to get more experience when i do the top one, as it tell you in the book the wood strip are not all the same size the vary so each one has to be sanded to 5mm jig time is coming up