Drilled holes for hatch side latches and install with coated wire to not-yet-installed handle.
Cut kerfs in birch inside ply of 1/4in luan for hatch and dry fitted again to draw where inside ribs can be screwed into when glued.
Attached living hinges to countertop hatch doors via #4 wood screws and put floor tiles on countertop – had to diddle with ring pull cutouts in linoleum tile so they were flush.
Re-dry fitted the hatch frame with the linoleum in place and determined it did not affect the fit.