drupal for clearance system

Hi,

I need suggestion on how to go forward with developing a small system for hardware clearance. I have used drupal for sometime but never worked on a system development with drupal. I am not sure if this hardware clearance system can be done using drupal. What the clearance system does is that a user/organisation fills out a form for their hardware requirement (specifications on Desktop/laptop/servers etc.) and our office has the authority to approve/disapprove their applied hardware specifications. so basically what i need is:
1. the first form will have options to choose like desktop, laptop, server, printer etc. If the user chooses for eg. Desktop and clicks next...that should take them to the respective form for filling out the specification for Desktop. I have no idea on how this can be achieved in drupal.
2. After filling out the form for the desktop, the user then submits the form for approval. A notification via email will be sent to the approving authority that someone has submitted a form for approval.
3. On receiving the email, the person in-charge will go to the system, manage the submitted form. He should be able to click to open the form. This form will have all the fields as submitted by the user and have additional fields like letter no., evaluators name, signatures which the person in-charge will be filling up. Then the person prints it out in a customized layout with letter head, letter no., submitter's info., the specification applied for, and at the bottom of the page the evaluator's name and signature. This if approved will be send to the user/organisation who applied for it.

I know part of this can be done with webform module like creating forms and sending notification via email. but what iam not sure of is the no. 1 and no. 3 step i have mentioned above. and when the in-charge checks the submitted form, he should be able to mark the form as approved or disapproved so that he will not mix the form already evaluated with new submitted forms.

Any help or better idea for developing the system than that i have listed above would be appreciated.

Thanks