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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Break it into what you think is manageable chunks. Leave an atrocious amount of space in between things (I'm still not good at this). I spend a lot of time rearranging the diagram output from satisfactory tools (last picture) and take a screen grab to act as a checklist. For that post in particular I also numbered the saves for each phase of the checklist so I could make the time lapse from screenshots of the interactive map website (SCIM). (Currently I just number each session as a separate save like so I never have to go back more than a few hours if I royally screw something up.)