It was mostly finished and in production except that for large surveys it was just too slow.  So the plan was a rewrite with all collateral being stored in JSON DB tables, since a single DB read and building the entire survey from a JSON string was faster than multiple DB calls.  But I'm still working up the gumption to finish it.  I'm on vacation now, but $work still makes occasional demands and I'm in the midst of moving.  To make a long boring story shorter, if you want to help, please be my guest.  A working version is in the Survey2 tree, but I'll have to send you the DB tables and templates.  That version doesn't have anything JSON-ified.  If you want me to help, nag me and extol the virtues of foss and how this will help me find a paying foss gig.

Here are the DB files.  Only the Reponse collateral tables will stay.  The rest will be rolled into the Asset table as JSON collateral columns.  The templates I'll have to dig up later.