I've got a cockpit floor on my Recretec frame. It detaches easily with pins, but I've never done a trip without it.
good place to do a happy dance after surviving big rapids
makes a great platform for strapping down a rocket box, water jug, or day cooler on either side (just cut a hole for strap through the floor)
drains more slowly than rest of the boat, but it only holds a couple inches max
I find the positives outweigh the negatives. I can post pictures, but that won't help you with figuring out how to do it with an NRS frame.
Show me your OOOOOO face