I installed Tek-Dek, which is the same or similar to Flexiteek. The UK firm sent me woven plastic that is dimensionally very stable to use for making my templates.
So far I have installed the Tek-Dek in the cockpit and the cabin
top and next winter I will do the side decks and foredeck, then I am done.
It looks like real teak (I chose the "weathered" look), is very non-slippery, cleans with a pressure washer and is really easy to install by oneself. Bigger pieces might need two people to position it.
Also using a pneumatic sausage gun made installing the large cabin
top piece a dream.