php - Converting a raw project into a Symfony project -

i'm building simple cms system. in raw version (which without frameworks - written me), contains 3 base folders:

admin
content
system

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admin - displays admin control panel, set of classes responsible kinds of editions on website etc.

content - handles generating proper website, contains kinds of user "templates" etc.

system - contains configuration system, etc.

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now, i'd implement symfony here, have pack these classes mentioned above src subfolders , bundles.

i haven't thought yet, question simple: is idea divide src folder into: admin, content, system subfolders, , divide content bundles?

is require in project use mvc pattern i'm doing here?

maybe it's better map 3 functionals sepereate bundles

youradminbundle yourcontentbundle yoursystembundle 

their content can divided different controllers bundles. if have big functionality can split seperate bundle.