I installed PlasDeck DIY and very pleased. I used the teak & off white caulk line to match the interior saloon sole. The off white does require a little TLC to keep bright. Some recommend the black caulk lines to avoid that issue. Very much a personal preference and not a show stopper IMO.
For a more complete write up w pics see Project Section on my Bacchus website
https://dkloeber.wixsite.com/bacchus
For templating the mfg recommended Tyvek or equivalent / knock-off as it lays flat and is dimensionally stable. They sell a clear template matl (mylar?) For use where /if you have many hatch cut outs as it's easier with clear. If working right up to a vertical surface there are some tricks to get it exact.
I had the factory do the assembly as I preferred their plastic welded plank seams instead of the DIY super glue approach and the added cost was not huge and worth it to me.
If you cover any low spots like smooth FG between non skid areas you have to level with extra adhesive prior to or during install. Not difficult but there are a few tricks.
Plywood "pads" for walking & especially kneeling while working are a must to prevent leaving indentations.
I layed mine in 3 section, cockpit deck and 2 side decks in an afternoon with 2 helpers. One to roll with a flooring roller after laying and the other to hand us stuff and periodically clean towels while working.
Happy to provide more details if any questions.