Any help would be great!
There is an example of how to submit the data and jump to a page here:
You would have to make some significant modifications to get your menu idea to work, but it certainly should be possible.
As for the problem of navigating between sections – you might want to contact SurveyGizmo Support and ask if the Section Navigator action is still available. This action allows you to break your survey into sections, and then allows respondents to navigate between sections. We have used this for special projects, so I will give you the following warnings:
This action is not a standard SurveyGizmo feature. This action can damage a survey if not implemented correctly. It is very rudimentary and offers no means to modify it in anyway.
When you define your Page Groups, make sure that you get them all correct the first time. If you have to go back and make changes, the old Page Group(s) will still appear on the navigation menu.
Play with this action on a test survey before you try to implement it. The first time we tried to use Section navigation we were careless and destroyed half of an existing survey.