Would splitting it up into multiple sections work? Focus on one standalone piece at a time and then combine it all together.
Depends on the project. For this one I'm using Blockly to generate Javascript and put html stuff around it. I originally used Batari Basic for Atari games, and then most of the games I made were with Google Web Designer. I do remember you mentioned somewhere something about using Unity eventually, so is that still on the table or not anymore?