Custom Application Creation in Fusion

Hi,

We are having an requirement in which user has to access a custom application from is Fusion Login. Upon accessing the application he should be allowed to draft an content and attach a couple of files.

Then submit it for predefined Approval Hierarchy for the attached document to be approved. Approver should be able to read the content and refer the attachment before approving it. Once document is approved document should be accessible to initiator from the UI as we are able to access a given Purchase Order at any point in time from Procurement page.

For this application what would be the recommended approach or tool to be used. Can this be done from Application Composer?