Hard to Open Sliding Hatch
Starboard is a wonderful material but requires a special glue; nothing else will adhere to it. It does seem virtually indestructible.
Our hatch cover rests upon brass tangs screwed to the under side of the hatch and closely fitted into brass U shaped tracks recessed into the sides of the companionway. Likewise the vertical edges of the drop boards are encased in brass and slide in similar but larger U shaped tracks and both slide with ease although sometimes a bit noisy. They show little or no wear after 30 years. Speaks well of the brass recommendation from your yard.