They are mostly grown lowland PNG and can fruit at a small size.I saw a 2m tree with fruit.The PNG community here grows them sometimes as they do buk buk,firetruck pandanus and a few other favoured New Guinean species.
Apparently, there is huge variation in cut nut. Supposedly, there are clones that only get about 2 m tall (but have a poor yield) -- at least in Solomon Islands & Vanuatu, I assume that these forms also occur in PNG. I posted a couple of docs recently that deals with this.
I suspect if you are growing this in FL, you are on borrowed time.