In the 710K I will fit, I'm 5'10" and I can situate myself just right to make it work. Any taller and there will be problems. That being said, if the hammock is hung diagonally for one person someone 6' or perhaps more could fit. A 712 has all the length in the world and could perhaps accommodate several diagonally hung across in a row. Don't know how you would fasten but it might be worth a look for more than 2 campers.
I weigh about 170 pounds depending on how much beer I consume, and my son is about 110-120. We didn't have any problem with the bars of the screen bending. The hammocks were from a surplus army store and I was able to string them to have fairly short lines on the end.
Kids love hammocks! Dads do too but are more particular to the HUGE kind that can be set up outdoors that have an attentive wife/kid bringing cold ones as needed. Your mileage may vary on that one...

If you didn't get stuck, you didn't try hard enough.
'74 710K
1984 in 2009