Does anyone have any experience with multi-step forms to create / update content? Existing Drupal modules that I've found are pretty old and seem somewhat shaky. I'm guessing that people who've needed this kind of interface wrote custom solutions.

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If it's just about some simple data, Webform is probably your friend. Then display form submissions in a view.

If it has to be nodes, hook_form_alter() might be your friend.

But maybe @docwilmot has better tips. It seems, he ported/forked the Ctools form wizard.

I did wonder if doing some kind of Webform => node submission would do it. Depends on if they need the multistep only for creation, or for editing as well.

 

Sorry I dont have a ready solution to this. The big issue is of course if you need multistep editing as well as creation, in which case Webform wouldnt help. A custom mutistep form would also be complicated if you decided to be able to add or remove new fields. 

Best bet is to port https://www.drupal.org/project/msnf. It isnt pretty old (2011) but not sure if its shaky.