We are a computer vision startup in Esri's emerging partner program -- our platform turns street photos from smartphones into 3D imagery (www.mapillary.com). Esri has encouraged us to look into building a custom widget -- we are new to WAB so any help or guidance is appreciated. We're currently working on an open source version of our viewer (https://github.com/mapillary/mapillary-js) and want to figure out how to build it into a widget. We hope the 3D landscapes will be useful telling stories and extracting data in apps for public works, parks, transportation, and more.
We see that rscheitlin made a Google Street View widget which looks like it works nicely. Do you have any advice for us?