Look what’s missing

You want a good seal as the coring is balsa. If it gets wet, not good.
 
Looks great! Any chance you supply the part number for reference?

I believe the rails were built for the Tiara Yacht. It appears to no longer be available where I made the purchase, but here is a link for the vender with search. They may have something that will work for you needs.
 
I appreciate that. I was hoping you had the party number so I could just do a Google search for availability.