Cakephp: 1 core 1 app many webroot?

Hi I'm a new born programmer trying to build a system that user can register then get a free prebuild system( sample webroot) that i make.

The problem is all user will share the same logic (app folder) only different on their UI (webroot).

So I will copy the prebuild system (sample webroot) to their folder on their register.

How can i share app folder with multi UI (webroot) of their prebuild system.

My folder structure is:

lib

app

webroot (mysite UI)

prebuildsystem

usersystem

   |-user1(webroot)

   |-user2(webroot)

   |-user3(webroot)

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