Is this feasible with Drupal?

Hi,

We develop Wordpress based sites primarly but a client has a Druap site and now requires a survey form. They have specis=fied teh follwoing functionality;

- Users have to answer 15 questions using radio buttons
- Users to be told if their answer is correct/incorrect, but not be able to change their answer once picked
- If an incorrect answer is given, the correct answer must be shown along with an explaination
- The question must link to the relevant section of a supporting website
- The client wants to run reports on the questionnaires use - i.e. Number of people using it, how long they spent on it, how people were scoring against particular questions etc...

I have just installed a test Drupal 6 system and webforms and FormBuilder modules.

First impressions are that these might just do the basic functionality but probably not the finer points and almost certainly not teh reporting aspect.

So,

Are there any other modules worth looking at to help towards the above?

Would it be easier to code our own standalone php/html/css page to wedge into the Drupal framework? (not sure how the admin reporting would then be done)

How long do you think it would take an experienced Drupal developer to write a module to do exactly what we need?

Any help or advice appricaited.