If your not familiar with the concept of a design sprint, you should really check out this video on YouTube (https://www.youtube.com/watch?v=aWQUSiOZ0x8). Design sprints are the only way to build a professional application IMHO. I would be so phenomally awesome if JUCE created a design sprint tool that would work as shown in the second presentation of the Google I/O 2014 - The design sprint: from Google Ventures to Google[x] video around the 15 minute marker. If JUCE had a design sprint tools based on the IntroJucer, it would make JUCE the goto API for rapid prototyping of applications for both desktop and mobile.