With the rino-liner I would worry about 2 things:

1) weight - I think that stuff is pretty heavy
2) getting it in white - black would be too hot to walk on.

I just posted this on another thread, but SeaDek might work for you.
It comes in 5mm and 3mm thickness, it relatively soft, comes in
several colors, and is relatively cheap as far as decking goes. Here
are some pictures that I took of some samples:

http://www.boatbuildercentral.com/help/SeaDek.htm

Joel