No you don't need it. All objects, triggers, markers, timings, units etc can be placed and tested using nam pack 1, then tweaked using nam pack 2.
Not having pack 2 is no excuse.
About the pack.
Some issues have come up with some of the weapons.
I spent hours observing each unit in 1 on 1 fighting against a default test unit. Each unit fought about 20-30 times against the default unit. I then recorded the scores. So now some of the config data needs tweaked for the weapons and units.
That is what is holding it back at this time.
I'd like to get it out before the US holiday this week, but it's not certain. Some more testing may need to be done.