Cockpit Duckboard

I did exactly the same. I glued it with PU adhesive (having cleaned the areas to be glued with acetone) and screwed it (from below) with A4 stainless wood screws. Has lasted 10 or 12 years so far with no problems at all. I left the wood untreated.
 
I am about to build a slatted cockpit duckboard using 20mm x 60mm Iroko.
Should it be glued and screwed, just glued, just screwed?
What glue?
What finish?
TIA
The construction design of using 20mmx60mm using Iroko should be fine. I made two cockpit locker lids one time in Iroko . Schoolboy error, I did not provide rib support on the undersides to stop the Iroko cracking. Which it did.
 
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