I've just had a first look at the Upfront builder and am kind of overwhelmed. Great product. I haven't found the time to deeply dive into what's possible and what not but at first I couldn't find how to customize things that are not WordPress Standard like let's say templates for custom post types or insert custom field output into existing templates.
I've some projects in the near future that need some of that stuff and I though I'd ask before investing time into Upfront if it will make me happy regarding these topics.
Thanks for helping!