How do you propose to distribute this app that was built on the fly - you're going to go for App Store approval in under a minute?? I think "app" is the weakest part of this idea.
Its an app inside the main application(pre-approved).It contains all the logic for UI elements and api calls etc.
The main app assembles the lego blocks.
ah, i see. so it's kind of like a website that changes depending on what you're doing and where you are.