3/4 Starboard is the way to go!! Here we have a place that also sells Seaboard, for restaurants and stuff, its the same stuff but cheaper!
I did my whole boat with the stuff walls, floor covers, and the forward bulkheads under the windshield.
Another way is to go to your local DIY store, Lowes, Home Depot, ect. and get that new plastic decking lumber, and make the covers, another member here did that and they looked great! 
Here is some pic's from my boat
The possibilities are endless!
Cuddy tracks
Gas tank covers and transom cover
Bulk heads
Tank covers
Built in tackle box