Dimensions of floor board needed Achilles shd-170

[PacificOption]

I recently acquired a 1986 Achilles SHD-170. The front floor board is missing. There is a homemade replacment present, but I am doubtful it is the correct size. I am also not sure if it is connected correctly. If anyon can help, I need the orginal dimensions and a picture of what achilles provided to link the front board to the aluminum floor boards.
Thanks in advance

[Ketted]

Hello There, not exactly what you are seeking but the attached may serve as a guide. Hope it Helps: https://www.achillesboats.com/pdf/fi...es_catalog.pdf

[909]

Inflate the boat.

Cut a piece of cardboard to fit.

Transfer that template to marine plywood.

Sand , seal and finish with epoxy.