Looking good Ken. Now I see what the azipods were for
This build is similar to what I was doing 20 years back with the pods. The boat I was attempting was at the time the Stena Seaspread-interestingly it got seconded to serve time in the Falklands campaign. I gave up on her, hence the azipods, 2 years of spending all my spare time and getting visibly no further drained my will to carry on.
Anyway, as to sticking down your plastic to ply deck. Best adhesive is Evo Stik contact adhesive. Coat the ply coat the plastic wait five minutes and stick together-permanently! Just make sure any lining up is done before the surfaces touch because their is no removing it.
So I'll sit back and wait further updates.