Bravo, Megan
Just a little word in defence of Declared Conditions: JT seemed to be implying that these should be headed for the bin, but I say:
What else can you use when planning your payload uplift from a place a few days, or weeks ahead of now? You obviously don't have ambient conditions, and I believe the regs stipulate that you must use the declared conditions.
Unlike probably 90% of Australian pilots, I have actually used them in anger, and can attest to their convenience.
Here is a great big hint to the people behind the NAIPS app for the iPad/iPhone:
Include the declared conditions in your app, somewhere. And while you are at it, get it to present the conditions not as a density altitude, but as a temperature and pressure altitude. That would be really good. Do it. Just do it.