Did you ever find a big plate and where did you get it?
Our club has a single 6 or maybe it's an 8, works great. Liked it so much, I built one for an Oktoberfest festival last week, but I used 3 separate 2-port plates worked great.
However after using it Saturday, I'd like to go to a single plate. It was hard to dump the ice and manage the three plates while doing so.