Installed synthetic teak pvc decking kits for boat are available. Just pvc welding, no glue!
Nonetheless,smaller projects, like installing a new “teak” cockpit sole, seats or a transom
swim step, should be well within the ability of a careful DIY sailor. Although synthetic teak
can be ordered in strips, which fit together in a tongue-and-groove fashion, a better course
is to mail a paper template to the factory, which will then
produce a finished piece for you to install