I'm quite familiar with the internals of Gravity Forms, and how to do multi-page forms and post-submit processing in PHP as needed. My plan is to get you a functional demo in 2-3 days, then optimize as needed.
There are several ways to style and format the GF page to match requested styling. I also have working code for a customized PDF generator compatible with GF, beyond what the GF PDF Extended plugin offers.
Due to NDAs, I don't typically demo customer sites or test versions, but I'd be happy to create a quick demo for your reference.
I noticed in your NDA regarding the laws of "New South Wales". I grew up north of Sydney but now based in San Francisco, CA.
Regards,
John